Jon, almost all of the bugfixes have been made on the 4.6 branch and not merged to the HEAD (and if you are aware of
any that were not made on the 4.6 branch please let me know
so I can merge them). The plan has been to make all the bug fixes coming out of QA on 4.6 and merge to the head after the
4.6 release.
The HEAD has the collaboraid i18n work and 4.6 does not (and won't ever I don't think).
I am planning on trying to make sure any bug fixes on the HEAD get backported to 4.6 and have 4.6 have an extended release cycle (more frequent QA'd minor releases) so that it will be a good basis for building a site. I think this is important since 4.7 will be a rough ride and is a long way off.
