The producers of GOT are obviously combining books into the series...The thing I am unsure about is what books will be used in series 3? I know in one of the books Tyrion isn't mentioned and I found that one a hard slog(forget which one it was) and I pray God that Peter Dinklage will play Tyrion throughout the series on TV-I really can't imagine the show without him.
I think most of us have a good idea of how Series 3 will end
( no spoilers here) and Martin himself has said he intends to go into hiding
once the third season hits our television screens(Lets hope it's to finish 'The Winds of Winter!!). But I would like to re-read the books that will be covered in season 3...Would they be A Storm of Swords/Feast for Crows?
As for the whole Jon Snow parentage, it's mere speculation and not fact. Although I'm inclined to believe it, the author does have a habit of putting in red herrings and then pulling the rug out from everyone.....
I just can't wait for the next installment as DWD ended in a cliff hanger!