On track for the upcoming 0.12.0 release, transifex for the 0.12 branch has been opened. Old strings and metadata have been copied where possible.
The planning for release candidate 1 is January 1 2016, aim for the final release is Februari 1 2016. New translation strings will be included up until the last release candidate.
See
https://www.transifex.com/projects/p/bitcoin/resource/qt-translation-012x/Translations for 0.11 will remain open so that further minor releases on that branch can include the new translations. I am going to close translations for 0.10.
Wladimir