Good morning,
The KDE SC 4.13 is available in experimental-snapshots. The version of all the packages right now is 4.13.0 except for kdelibs (which was already updated to 4.13.1) and kde-workspace (which is still 4.11.x because there won't be any kde-workspace 4.12.x or 4.13.x, as you probably already know).
KDE SC 4.13.1 was already released so the packages will be updated and moved to unstable soon if that's possible.
Warning: in this KDE SC release nepomuk was replaced by baloo. Unfortunately right now you can't deactivate it pressing a button like you did with nepomuk, this issue will be taken care of, however if that's a big problem for you feel free to hold your dist-upgrade until it's fixed.
Cheers.