I think some of the 'main' characters won't die/have a better chance at not dying until ADoS. Jon, Arya, Tyrion, Dany, Bran, Sansa, etc. no one is safe in these books, but those main POVs will live through TWoW for sure. I was mainly just stating that ol' George loves Tyrion, but it would be interesting if he'll die at all in the books.
I don't think Stoneheart will kill Jaime at the beginning of TWoW. My theory is she's going to use him to facilitate the Red Wedding 2.0 somehow. I think Jaime has a good shot of living through TWoW and then dying in ADoS; I'd love for him to live through to the end but I don't see George letting that happen to Jaime. Now, with Cersei, I think she's living on borrowed time moreso than Jaime. I could easily see her kicking the bucket at the end of TWoW.
Oh, and I definitely think Stoneheart/Cat will be laid to rest sometime in the next 2 books.
I'm thinking Varys will kill him when he figures out who Aegon actually is and that he's been set up by Varys.
Sounds very similar to Varys killing Kevan, but I could see it happening that way; Varys will have nothing to lose by telling the truth to JonCon as he is lays there dying.
I think Littlefinger is a goner, but it's a question of when he'll die, not if. I'm thinking it'll happen at the end of TWoW, or early on in ADoS. Would be awesome if it somehow tied in to how Lysa died, with her revealing some major shite. I think Littlefinger is going to reveal some major shite and Sansa will kill him; she's definitely noticed that she's his weakness and I definitely think Sansa will be Littlefinger's demise.