how I think this could go:
A, FB has minimal involvement, and OVR continues as before;
B, FB gets involved, maybe makes some actually sensible changes/additions:
* "hey guys, why not add a camera and ability to see passthrough and do AR stuff?..."
C, FB gets involved, totally screws it up:
* makes HW non-trivial to access from 3rd party software
* breaks or takes away LibOVR
* ...
D, FB buys it and squanders or buries it.
so, yeah, it depends...
but, granted, I had tried developing some for the DK1, but personally wasn't really able to get over its tendency to rapidly cause motion sickness.
also, an inability to see anything external without having to take it off quickly got rather annoying. was left wishing there was some sort of convenient "pass-through" button, and better still if it were wireless, ...
but, yeah, can still be cool, if the overall experience can be made better.
admittedly, I have actually had better results here with just using 3D anaglyph.
yes, anaglyph sucks and screws up colors and makes eyes uncomfortable and causes lingering aftereffects, ... but, at least it doesn't really cause any more motion sickness than normal, or some of the other drawbacks of an HMD.
granted, polarized light glasses better (no weird color effects), but requires an expensive monitor and more expensive glasses, ...
so, yeah, could be good, if it all becomes less expensive.
though, apparently, the experience can be better with more expensive anaglyph glasses (which use secondary color filters to help neutralize the colors from the primary filters, ...). but, alas, not as good for cheaper/generic glasses.
it also has an advantage working with normal monitors.
though there is a drawback in that (of the rare few games that support anaglyph) few support either customizable color filters or multiple types of glasses (they will hard-code red/blue or red/cyan and call it done, which isn't so good if one only has, say, green/magenta glasses).
it is almost a mystery if this could be combined with IR head-tracking to good effect (such that the monitor could be seen as a movable window into the scene, with the location and angle of the head being used to calculate the view through this window).
not sure the cheapest technology for this. likely possibilities are either using acoustic processing, or using IR LEDs and photoresistors (or photodiodes), probably with one part on the users' head (or glasses) and the other part stuck onto the monitor (such as via some sort of adhesive or double-sided tape), potentially connected up to the computer via something akin to a USB GPIO board.
though, for glasses-mounted LEDs, they would probably be connected to AA or AAA batteries or similar (then it could be wireless).
or such...