This RC includes a fair number of fixes since our last release and predominantly works on improving the stability of the 5.2 tree as well as including a small number of minor security fixes. I'd like to ask everyone to test this release against your code and setups, we are aiming for a quick release cycle and user feedback is critical for a successful release.
I humbly suggest disabling the installed php.ini for the site when running tests. Having ignore_repeated_errors on breaks a lot of tests (especially the fscanf ones), so it ends up wasting time for both of us. You get a bogus report, and I have to run the thing again to send in a sane one.