KDE/4.10 branches have just been created for all the git repos (except for kdelibs that already had it) and SVN branches/KDE/4.10/ has been populated with the modules still in SVN
From now on, if you want something to end up in the 4.10 release you'll have to commit it to there (in addition to master for future releases)
Tomorrow 17 December 2012 at 23:59 UTC, the following freezes for 4.10 kick in
* Tagging Freeze for Release Candidate 1
Only compilation fixes for all platforms are allowed to be committed.
Everything else (even showstopper fixes) have to be run through reviewboard, with the release-team and the affected maintainers as reviewer.
Tagging will happen on December 18 at 23:59 UTC
* Hard API Freeze
The API is now frozen. No more changes to APIs or header files (except docs) after this date.
* Hard Message Freeze
You need to contact kde-i18n-doc for every single string change
* Artwork Freeze
All artwork is frozen on this date. No new artwork should be added. Existing artwork can continue to be tweaked and fixed.
* Bindings Freeze
No new additions to the language bindings, except optional bindings as permitting by the kde-bindings team.
* Documentation Freeze
No more changes to documentation or handbooks after this date.
For typos, spelling and simple grammar changes you have to mail kde-i18n-doc for approval.
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.
http://techbase.kde.org/Schedules/KDE4/4.10_Release_Schedule