No, I don't think so even though I'd like to have a hg mirror as well.
I'll ask cboos/rblank how they did it for Trac.
fs
we'll set up github+bitbucket mirrors but it might take some days-weeks
(about 2-3 weeks realistically, maybe much faster) because we (I?) might
need to make the t.e.o syncing scripts more general/do some sysadmin stuff.
In the meantime, feel free to use git directly as a svn client
(personally I don't want to push a quick-hack repo as semi-official when
we can get something real within a month).
fs
Well, looking forward to your Babel patches/enhancements ;-)
fs