I guess the integration in the Havok Engine needs to be done by Havok itself? Would be good to know how their plans according to the Rift are.
Well the Havok physics engine is old and has been used in many games. But this would not really have much to do with the Rift. I thought you were talking about Havok's new 3D engine called Project Anarchy ( http://www.seoanarchy.com/about ).
How about Havok integration? It looks like a pretty cool engine, and I like a lot of the games that have been done with it. (e.g. Dead Rising). It also offers a free start for developing, although if your game earns more than $10,000 USD, then you have to start paying.
I would like to work with Oculus + Havok. Could that be possible in the near future?