I'm just going to go out on a limb here and say that I agree that Rey's parentage is heavily hinted toward Luke being her father. But honestly I could see them doing another borrow move from the EU and making her related to the Shan family. I keep going over in my head that in the movie that line in the trailer that Luke was saying about how the force is strong in his family could've been said to Ben Solo when they were beginning their training. I'm not buying into the idea that they need a family connection to sense each other's memories, or share visions together. If Rey is as powerful within the Force then no matter what those visions would've happened to her with the lightsaber because of the strong emotional users who wielded the saber before. The living force could've surrounded itself around that object . I know it's heavily implied but people really are grasping at straws at the Han/Leia theory. Lets not forget that we have other Jedi and force sensitive people in the Star Wars universe at this time. Kanan and Ezra could easily be one of her fathers. Not to mention they could just borrow another idea from EU, rename it a bit, and boom now we have a whole new plot. Ben Solo, and Moraband are literally from the EU and they just changed the names a bit. Also I'm not going to be happy if we find out she's a Solo. Just seems too convenient. So I'm going to stick with that she's a Shan that was discovered by the Rebel's crew and after Luke's disappearance they left her on Jakku to protect her from Ren/Snoke/Dark Side force users. I don't buy the idea that Ren wanted to train her because he knows they're family. I think he wants to train her so together they can overthrow Snoke. Just like every Sith does some day. They go out, find a powerful apprentice, train them and attempt to overthrow any Dark Side user ahead of the former apprentice. Not saying that Snoke/Ren are Sith but I mean I'd bet Snoke is an old school Sith who was trained on Moraband.