I am wishing *so hard* that Kylo Ren and Rey are brother and sister. It does require an awful explanation to pull off, but their first scene together read so clearly as sibling wrestling to me that I want that to be the reveal. The "I felt it too" connection could be twin link!

My personal headcanon: Leia in cahoots with Luke to lie about Ben's twin sister, in order to hide her to save the jedi (and redeem her brother). Luke showed precognition in Empire Strikes Back; he could have seen enough future to set up the ruse.

I don't expect it to actually play out that way, but until I'm proven wrong, it pleases me to think it's true!