I am dying waiting to get my hands and try developing on the Rift. From what I've heard, implementing support for the Rift isn't all too difficult. There's no reason the chinese room couldn't implement it in a patch, either. The CEO of Oculus said Rift integration can generally be added in a day or two, especially since HPL is written in C++ (the main language of the Oculus SDK).
Now, he does state that while support can be added in a day, developers will often find that their game isn't "VR ready" in the sense that for a good VR experience, everything needs to be scaled appropriately, be detailed, etc. So who knows whether or not the Rift would work well without a significant amount of work, but the fact of the matter is basic support could be added in a day and sent out via a patch. It is by no means unlikely that we'll see this in AAMFP.