I think the whole "Who is Rey" thing is going to be a massive part of the next two films. And yes, I think there's misdirection - there are a whole bunch of hints that she's Han's daughter as well (natural piloting abilities, Han is like "The father she never had" etc) but apparently not. I'd take the bet on her not being Luke's daughter either.

Also, a couple of things that I noticed - firstly, the entirety of the First Order (excepting Snoke who we only know as a hologram after all) are stupidly young. Even the general is just a kid. I think it's a Ken McLeod novel that characterises a group made up of the very old and the very young as the demographic of utter defeat. And the mighty rebel alliance/resistance seems to be reduced to a fighter squadron operating out of a shed. Clearly a generation of war has taken its toll.

Secondly, I really enjoyed the characterisation of Kylo Ren. After all, the Dark Side is powered by rage, and who is angrier than a stroppy teenager?