Hello,
since 5th of November jessie is frozen and so sid was partially frozen (aka slushy: only minor updates for bugfixes permitted). The debian release team has set 25/04/2015 as the ETA (Estimated time of arrival).
The next development cycle will start with a copy of Jessie in the new testing repo named "Stretch" and Sid being unstable as always. Then debian will be unfrozen and a flood of packages will stream into unstable. After 10 days packages without known issues can migrate into testing.
For siduction user this means: Immediately after the jessie release the gates of experimental repo will be opened and packages will run into unstable like a
stampede of wild GNUs. (just imagine you want to sort out the zebras ...)
So be prepared and make your last easy dist-upgrade today (Friday, 24/04/2015).
Things will eventually become rough afterwards and so you will better stay away from dist-upgrading a few days.
greetings
musca