Finally got around to watching TFA a second time earlier this week. It pains me to say it, but I'm now part of the "Rey Skywalker" camp. As Hack pointed out, the saber calls to her and R2D2 turns on to complete the map when she shows up. But the clincher to me is Luke's reaction when he sees Rey. If you look closely, you can see tears in his eyes and some shock on his face. That's an awfully strong emotional reaction for someone meeting either 1) a complete stranger or 2) his long lost niece. No, that's the reaction of a parent reuniting with a missing child. Finally, I leave you with this...