After watching this
trailer of Homefront, I began to wonder what physics engine is being used. After searching through the official website I found not mention of the physics engine.
Seeing as Kaos Studios previous title, "Frontlines: Fuels of War" uses Nvidia PhysX, it leads to the assumption that maybe Homefront also may use Nvida PhysX. Of course there is the possibility they may have turned to Havok for whatever reason, but Nvidia PhysX is a safer assumption.
It's just speculation right now, but if it turns out that Homefront actually does use Nvidia PhysX, let alone APEX Destruction I am going to feel pretty happy for calling it.