Found this from twitter:
So they have the feature in there, but it's disabled... Could this possibly mean that they're working on ways getting FaceTime a little less data hungry so they can enable this? Although, I don't even know how hungry FaceTime is over 3G.

So they have the feature in there, but it's disabled... Could this possibly mean that they're working on ways getting FaceTime a little less data hungry so they can enable this? Although, I don't even know how hungry FaceTime is over 3G.