Shared today on the kde-cvs-announce mailing list is word of this delay:
To accomodate for a few last minute changes we have decided to create an RC3, this pushes back the final release for about 2 weeks. You can see the new dates at http://techbase.kde.org/Schedules/KDE4/4.10_Release_ScheduleThe new schedule puts KDE SC 4.10 as being released on 6 February while the third release candidate will ship on 18 January. KDE 4.10 RC1 was released in mid-December and on Friday is the expected release of RC2.
If you have to update program version numbers, library abi numbers, bugzilla program version numbers or stuff like that, please do it as soon as possible.
Also please make sure to update the 4.10 feature plan so any non finished features can be moved to the 4.11 feature plan.
KDE 4.10 desktop features are talked about in this article.