Tested briefly on Virtualbox-Whonix. No obvious issues. When was 0.2.8.10-rc announced and how? I don't see any announcement on tor-announce or tor-talk. I wouldn't want to add jessie-proposed-updates to my stable machines and I don't want to check constantly if there are new versions on a test machine. But I'd like to test before stable release - and maybe switch my repo back deb.torproject.org.