Update existing templates and populate changes to already deployed VMs.

In one of our support cases about updating en deploying templates, the answer of RH support containted this section:

"There is an enhancement already filed to make it possible to modify an existing template and populate changes to already deployed vms. Future version of RHEV may include this feature."

With that a BUG# (unfortunatly not accessible to me): https://bugzilla.redhat.com/show_bug.cgi?id=558995

Does anybody have any information about this (any non-private source, maybe some work on oVirt?). I'm really curious how it would work to update templates/vms this way.

Thnx!