Ok SO...here is my theory based on everything that happened in 7.
Rey is Lukes daughter. She was training at the temple when Kylo came and murdered everyone, but her. She got away (either by Luke or on her own). Luke then used the force to wiper her memory or at the least, block our any remembrance of her identity and time spent at the temple and left her on Jaku. The kicker....her mother is also a Jedi, but she was killed by Kylo. This would explain why she is so in tune with the Force and was able to tap into it. It also explains the flashback to Kylo and the Knights of Ren
So for now, thats where I'll leave my thoughts.
Rey is Lukes daughter. She was training at the temple when Kylo came and murdered everyone, but her. She got away (either by Luke or on her own). Luke then used the force to wiper her memory or at the least, block our any remembrance of her identity and time spent at the temple and left her on Jaku. The kicker....her mother is also a Jedi, but she was killed by Kylo. This would explain why she is so in tune with the Force and was able to tap into it. It also explains the flashback to Kylo and the Knights of Ren
So for now, thats where I'll leave my thoughts.