The p2, Equinox and Eclipse Platform team are currently in the process of fixing a serious issue in p2 [1,2]. While the issue has existed for a while, it was masked by another bug (which has been fixed). This bug is critical because it can leave users in a completely broken state (plugins may appear to be installed, but won't actually function). In the worse case, Eclipse install may no longer start after a successful provisioning operation.
I would like to request a respin of Kepler SR2 (including the repository and EPP Packages). We are still in the process of rebuilding the Eclipse Platform, but I think we should start the discussion / vote here too.