There is a Bugzilla query that you can use to find the current blockers for this release: https://bugzilla.wikimedia.org/buglist.cgi?list_id=317367&product=MediaW...
This reveals an additional issue that hasn't seen much attention recently:
https://bugzilla.wikimedia.org/61092 -- Install hangs on 'Setting up database..' with php errors (due to permissions issue)
Thanks,
Mark.