User blog comment:James of the iron hills/Snoke the revived Darth Vader? Contains Star Wars 7 spoilers/@comment-25841881-20160110232207/@comment-26222246-20160112032733

Here goes the list of similar theories I have seen:

Plagueis is Binks

Plagueis is Reys father (seems legit)

Rey is Lukes daughter

Rey is Hans Daughter