Is the git repository git://gitorious.org/context/context.git in sync with the minimals?

It is but it is incomplete compared to the minimals and therefore may not be what you are looking for. Long answer: The repository is in sync with http://pragma-ade.nl/context/current/cont-tmf.zip (see http://gitorious.org/context/context/blobs/script/context_git_update.pl). However, the repository misses binaries, all extras and additional fonts that are available on http://minimals.contextgarden.net/.

If not, is there another revision control system repository for context that is?

AFAIK only privately maintained ones. Florian