We found an issue [1] in the ovirt-engine, and it was decided that even though we already released the 4.2.2 GA, that the issue is serious enough for the re-release of the GA to be performed.
We also rebuilt the appliance, to use this new ovirt-engine (version 4.2.2.6).
Users that managed to already install the originally released version, are encouraged to get the latest one.