i'm taking the over on the 4 main characters that die bet. I think we could lose as many as half, seeing as how half of the final season is over next week. Brienne for sure, Theon is my second highest confidence bet. lots of people don't contribute much so wouldn't be much of a loss - davos, greyworm, jorah. kind of think jorah might stick around seeing as how he has sam's sword but not sure. Jamie's story is pretty much over, so he might be toast. Tormund could go since Jamie and Brienne are going. podrick.
here's who I think makes it to episode 4: arya, sansa, dany, jon, sam, both dragons, Tyrion, varys, bran, gendry. the hound has a 50:50 shot.
bronn makes it to winterfell right before the battle and fights like a boss, and lives. nymeria also somehow makes and appearance and fights valiantly and wins. Melisandre is a mystery to me. they could use some divine intervention right about now, but she has said she and varys will die at kings landing. the lord of light could help but I don't think she shows up next week.
I had a theory that benjen was the NK, but then I realized the NK has been wreaking havoc since before benjen died, so scratch that theory.