re: Star Wars: TFA -Official Discussion Thread - Spoilers

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People are REALLY overthinking this, IMO.

I'd say it's 90% that she's Luke's daughter.

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Oh, that's highly likely. But right now, the story is still open, and we can speculate about things.

If Luke was only 10 years younger (and Hamill had aged better), I could definitely see Rey being his future lover, and I think that makes for a more interesting story than her being his kid from some anonymous and unknown woman.
if you want closure to the original cast, Luke can fall in love, return to the Force, and sacrifice himself for his young honey (or yes, his daughter).
That, or something similar, will probably be the end of this trilogy; Luke (with Ren at his side) taking Snoke and company out, leaving Rey as the only surviving Force user.