I liked River Song, too. She's a bit different in this season than last, but that's OK. One gets the feeling she goes through a lot with her Doctor(s) - it's amazing she keeps it all sorted!
Yeah, maybe this Doctor/Companion pairing will have the Companion be a bit more of a leader. As for 'getting married tomorrow' I have a feeling that won't happen, at least not as planned. Companion boyfriends don't have a great track record!