Only strange thing is apt not saying anything about the removal, that sounds like a bug.
Strange!
On 2 siduction systems, this morning, apt said kde-standard and plasma-widgets-addons would be removed, and many updates would be installed. I went ahead with the d-u, because I don't use the additional widgets, and there is no apparent damage of any kind to either system.
/var/log/apt/history.log says:
Start-Date: 2016-05-29 06:56:58
Commandline: apt full-upgrade
Install: libkf5calendarevents5:amd64 (5.22.0-1, automatic), libkf5kdegames7:amd64 (4:16.04.0-1, automatic), libgrantlee-templates5:amd64 (5.0.0-3, automatic), libkf5kmahjongglib5:amd64 (15.08.3-1, automatic), kdegames-mahjongg-data-kf5:amd64 (15.08.3-1, automatic), libpoppler61:amd64 (0.44.0-2, automatic)
Upgrade: milou:amd64 (4:5.4.3-1, 4:5.6.4-1), libreoffice-math:amd64 (1:5.1.3-1, 1:5.1.3-2), ktuberling:amd64 (4:4.14.0-1, 4:16.04.1-1), libkf5kdelibs4support5:amd64 (5.16.0-1, 5.22.0-1), libkf5kdelibs4support-data:amd64 (5.16.0-1, 5.22.0-1), libreoffice-report-builder-bin:amd64 (1:5.1.3-1, 1:5.1.3-2), dolphin:amd64 (4:15.08.3-1, 4:16.04.1-1), khelpcenter:amd64 (4:5.4.3-1, 4:16.04.1-1), kwalletmanager:amd64 (4:15.08.3-1, 4:16.04.1-1), poppler-utils:amd64 (0.38.0-3, 0.44.0-2), libseccomp2:amd64 (2.3.1-1, 2.3.1-2), bovo:amd64 (4:15.08.3-1, 4:16.04.0-1), libksignalplotter7:amd64 (4:5.4.3-1, 4:5.6.4-1), kate5-data:amd64 (4:15.08.3-1, 4:16.04.1-1), kbreakout:amd64 (4:15.08.3-1, 4:16.04.1-1), kde-cli-tools:amd64 (4:5.4.3-1, 4:5.6.4-1), kblackbox:amd64 (4:15.08.3-1, 4:16.04.0-1), libmono-system-xml4.0-cil:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), kshisen:amd64 (4:4.13.1-1, 4:16.04.1-1), kjumpingcube:amd64 (4:15.08.0-1, 4:16.04.0-1), qemu-system-mips:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), qemu-system-misc:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), breeze-cursor-theme:amd64 (4:5.4.3-1, 4:5.6.4-1), libgnutls-openssl27:amd64 (3.4.12-1, 3.4.12-2), libmono-corlib4.5-cil:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), libreoffice-java-common:amd64 (1:5.1.3-1, 1:5.1.3-2), qemu-system-ppc:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), kate:amd64 (4:15.08.3-1+b1, 4:16.04.1-1), print-manager:amd64 (4:15.08.3-1, 4:16.04.1-1), libosinfo-1.0-0:amd64 (0.2.12-2.1, 0.3.0-2), libreoffice-base:amd64 (1:5.1.3-1, 1:5.1.3-2), gwenview:amd64 (4:15.08.3-1+b1, 4:16.04.1-1), libreoffice-core:amd64 (1:5.1.3-1, 1:5.1.3-2), libmono-system-drawing4.0-cil:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), libprocesscore7:amd64 (4:5.4.3-1, 4:5.6.4-1), kwin-style-breeze:amd64 (4:5.4.3-1, 4:5.6.4-1), libpoppler-qt4-4:amd64 (0.38.0-3, 0.44.0-2), kmahjongg:amd64 (4:15.08.3-1, 4:16.04.0-1), klickety:amd64 (4:4.12.4-1, 4:16.04.0-1), libkf5sysguard-bin:amd64 (4:5.4.3-1, 4:5.6.4-1), libpoppler-qt5-1:amd64 (0.38.0-3, 0.44.0-2), picmi:amd64 (4:15.08.3-1, 4:16.04.0-1), kde-style-breeze:amd64 (4:5.4.3-1, 4:5.6.4-1), libkf5plasma5:amd64 (5.16.0-1, 5.22.0-1), libkcompactdisc4:amd64 (4:16.04.0-1, 4:16.04.0-2), console-setup-linux:amd64 (1.143, 1.144), qemu-system-x86:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), breeze:amd64 (4:5.4.3-1, 4:5.6.4-1), console-setup:amd64 (1.143, 1.144), kmines:amd64 (4:15.08.3-1, 4:16.04.1-1), kfourinline:amd64 (4:15.08.0-1, 4:16.04.0-1), qemu-user:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), mono-4.0-gac:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), user-manager:amd64 (4:5.4.3-1, 4:5.6.4-1), libcupsfilters-dev:amd64 (1.8.3-2+b1, 1.8.3-2+b2), konsole:amd64 (4:15.08.3-1, 4:16.04.1-1), kde-style-breeze-qt4:amd64 (4:5.4.3-1, 4:5.6.4-1), dh-strip-nondeterminism:amd64 (0.016-1, 0.017-1), libkf5runner5:amd64 (5.16.0-1, 5.22.0-1), libksgrd7:amd64 (4:5.4.3-1, 4:5.6.4-1), kbounce:amd64 (4:15.08.3-1, 4:16.04.0-1), libfile-stripnondeterminism-perl:amd64 (0.016-1, 0.017-1), libreoffice-style-galaxy:amd64 (1:5.1.3-1, 1:5.1.3-2), libreoffice-base-core:amd64 (1:5.1.3-1, 1:5.1.3-2), kwrite:amd64 (4:15.08.3-1+b1, 4:16.04.1-1), kde-cli-tools-data:amd64 (4:5.4.3-1, 4:5.6.4-1), kpat:amd64 (4:15.08.3-1, 4:16.04.0-1), qml-module-org-kde-games-core:amd64 (4:15.08.3-1, 4:16.04.0-1), ksquares:amd64 (4:15.08.0-1, 4:16.04.0-1), kblocks:amd64 (4:15.08.3-1, 4:16.04.0-1), bomber:amd64 (4:15.08.3-1, 4:16.04.1-1), granatier:amd64 (4:15.08.3-1, 4:16.04.0-1), libmono-system-configuration4.0-cil:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), cups-filters:amd64 (1.8.3-2+b1, 1.8.3-2+b2), mono-runtime-common:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), libreoffice-impress:amd64 (1:5.1.3-1, 1:5.1.3-2), kapman:amd64 (4:15.08.3-1, 4:16.04.0-1), qemu:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), libiec61883-0:amd64 (1.2.0-0.2, 1.2.0-2), libmono-security4.0-cil:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), libcupsfilters1:amd64 (1.8.3-2+b1, 1.8.3-2+b2), qemu-utils:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), kinfocenter:amd64 (4:5.4.3-1, 4:5.6.4-1), mono-runtime-sgen:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), knavalbattle:amd64 (4:4.13.3-1, 4:16.04.0-1), killbots:amd64 (4:15.08.3-1, 4:16.04.1-1), ure:amd64 (5.1.3-1, 5.1.3-2), kollision:amd64 (4:15.08.3-1, 4:16.04.0-1), libreoffice-writer:amd64 (1:5.1.3-1, 1:5.1.3-2), knetwalk:amd64 (4:15.08.0-1, 4:16.04.0-1), qemu-system-sparc:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), libtheora0:amd64 (1.1.1+dfsg.1-13, 1.1.1+dfsg.1-14), libtheora0:i386 (1.1.1+dfsg.1-13, 1.1.1+dfsg.1-14), libreoffice-common:amd64 (1:5.1.3-1, 1:5.1.3-2), katomic:amd64 (4:15.08.3-1, 4:16.04.0-1), libmono-system4.0-cil:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), libfontembed1:amd64 (1.8.3-2+b1, 1.8.3-2+b2), kdiamond:amd64 (4:15.08.0-1, 4:16.04.0-1), libkf5plasmaquick5:amd64 (5.16.0-1, 5.22.0-1), kiriki:amd64 (4:15.08.3-1, 4:16.04.0-1), qemu-user-binfmt:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), ksysguard-data:amd64 (4:5.4.3-1, 4:5.6.4-1), keyboard-configuration:amd64 (1.143, 1.144), qemu-kvm:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), breeze-icon-theme:amd64 (4:5.4.3-1, 4:5.22.0-2), cups-filters-core-drivers:amd64 (1.8.3-2+b1, 1.8.3-2+b2), ksysguardd:amd64 (4:5.4.3-1, 4:5.6.4-1), mono-gac:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), libkf5kdelibs4support5-bin:amd64 (5.16.0-1, 5.22.0-1), fonts-opensymbol:amd64 (2:102.7+LibO5.1.3-1, 2:102.7+LibO5.1.3-2), plasma-framework:amd64 (5.16.0-1, 5.22.0-1), libgnutls30:amd64 (3.4.12-1, 3.4.12-2), libgnutls30:i386 (3.4.12-1, 3.4.12-2), libmono-system-security4.0-cil:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), konsole-kpart:amd64 (4:15.08.3-1, 4:16.04.1-1), libortp9:amd64 (3.6.1-2.5+b1, 3.6.1-2.6), libunistring0:amd64 (0.9.6-1.1, 0.9.6+really0.9.3-0.1), uno-libs3:amd64 (5.1.3-1, 5.1.3-2), qemu-system-arm:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), klines:amd64 (4:15.08.0-1, 4:16.04.0-1), moreutils:amd64 (0.58-1, 0.59-1), libkf5sysguard-data:amd64 (4:5.4.3-1, 4:5.6.4-1), libpoppler-glib8:amd64 (0.38.0-3, 0.44.0-2), libreoffice-calc:amd64 (1:5.1.3-1, 1:5.1.3-2), libkf5kdegamesprivate1:amd64 (4:15.08.3-1, 4:16.04.0-1), khelpcenter4:amd64 (4:5.4.3-1, 4:16.04.1-1), gir1.2-libosinfo-1.0:amd64 (0.2.12-2.1, 0.3.0-2), libprocessui7:amd64 (4:5.4.3-1, 4:5.6.4-1), libdolphinvcs5:amd64 (4:15.08.3-1, 4:16.04.1-1), libmediastreamer-base3:amd64 (3.6.1-2.5+b1, 3.6.1-2.6), mono-runtime:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), ksysguard:amd64 (4:5.4.3-1, 4:5.6.4-1), qemu-system-common:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1), libreoffice-base-drivers:amd64 (1:5.1.3-1, 1:5.1.3-2), kdegames-card-data-kf5:amd64 (4:15.08.3-1, 4:16.04.0-1), qml-module-qtquick-controls-styles-breeze:amd64 (4:5.4.3-1, 4:5.6.4-1), libdebconfclient0:amd64 (0.210, 0.211), libreoffice-draw:amd64 (1:5.1.3-1, 1:5.1.3-2), libmono-cairo4.0-cil:amd64 (4.2.1.102+dfsg2-7, 4.2.1.102+dfsg2-8), libreoffice-avmedia-backend-gstreamer:amd64 (1:5.1.3-1, 1:5.1.3-2), cups-browsed:amd64 (1.8.3-2+b1, 1.8.3-2+b2), qemu-system:amd64 (1:2.6+dfsg-1, 1:2.6+dfsg-1+b1)
Remove: kde-standard:amd64 (5:90), plasma-widgets-addons:amd64 (4:5.4.3-1)
End-Date: 2016-05-29 06:57:48
EDIT: Slightly OT, it appears we've got a regression of the "xrender compatibility deprecated" issue, regarding panel icons. Chromium and skype are still there where I previously parked them, but the icons are now completely transparent. An annoyance -- the packages still run when the icons are clicked. But visually it is a bit disconcerting.