I think Luke will end up being her father. It's clear Rey has been having visions of Luke thru the force, but wasn't able to piece things together until she touched the lightsaber that was cut from Luke's hand. We already know that she had a vision of the island Luke was on, as Kylo Ren was able to pull that out of her head. I'm thinking she made the doll of the X-Wing pilot on Jakku because of another vision of Luke. Guess we'll see in 18 months.