On devel branch, I noticed that source are downloaded twice :
1 time on line 92 of FedoraReview/review_helper.py
{{{
def __run_checks(self, spec, srpm):
self.checks = Checks(spec, srpm )
}}}

the other on line 99

{{{
rc = self.__download_sources()
}}}

this could be annoying if a tarball is big enough, so I guess this should be fixed.