So, this is possibly the coolest fan theory I've come across for the new trilogy. I really dig it, and it actually makes some great sense from a writer's standpoint. What if Rey is not who she think she is? *Warning, SPOILERS! Duh..*
I've always loved this. The film titles were always open for interpretation, much like the films themselves! I think that's why the movies are classic: you were never just told something in Star Wars. As the audience, you were expected to figure it all out for yourself. That's what makes good movies.