User blog comment:M(G)P/New Nova/@comment-4772145-20130117214909

Well, I believe that most of these answers will come once the new Nova series starts in February. Jeph Loeb said that it will be there where we'll know everything (or most of it) about Sam Alexander

And maybe in Guardians of the Galaxy we'll see the answer of how Thanos and Starlord made it back from the Cancerverse while Richard didn't