Hello,
the last week the "KDE Software Collection" was updated to it's latest version 4.12.2; as you could see it went directly to unstable. The reason was that they were no significant changes in the packaging and also when the packages were ready the new version was already officially released. In other words, I don't expect problems with these new packages; however if you find anything wrong, you may post your issues in this thread, as you usually do.
The experimental kdepim packages of kdenext/kdepim-ng were updated to their 4.12.1 version and probably they will be updated to 4.12.2.
Cheers.