I don't think the girl will end up being River, or even the Doctor's daughter. I think due to the episode it could well be Amy's daughter. However with all the timey whimey stuff, it could be anyone lol.
River and the Doctor have definitely been lovers in her past at some point.
The regen thing is odd, but if it turns out to be Amy's daughter then I guess there could have been some interference from the time vortex and given her some time lord abilities.
Moffat has been the best thing about new who since it returned. Am looking forward to next week. Pirates and Lily Cole
