I say that as someone who was part of the RHEV support team at launch.... RHEV 2 was a mistake. Red Hat should never have sold a product that depends on windows. They just don't know how to support it.
There was also talk about bringing in parts of the JBOSS stack... and I am not exactly sure why... but synergy might have something to do with it.
RHEV 3 will use more oVirt developed technologies (libvirt, etc) but now they have Enterprise customers who need compatibility for an extended period... so its going to be the ugly stepchild of RHEV2 (aka Qumranet's Product) and oVirt (redhats R&D). I suspect that RHEV is going to be carrying around baggage for a while.