This upcoming Sunday night will be brutal already. Hopefully the C's don't lose Game 1 that day either
If I had to take a guess, the characters who survive this week will be Jon, Dany, all the Starks, Ser Davos, Sam, Tyrion, the Hound, Jamie and Gendry. Then obviously there will be other survivors (lesser characters). Unfortunately, I think everyone else is basically fair game to get killed. I really hope Thormund and Brienne don't die but I think there's a chance they do.
As many have mentioned though, I think they really foreshadowed the crypt. I don't know what it is, but something big will definitely happen down there. Maybe the dead rise, or the wights find some way in? We'll see. Maybe more secrets will be found there that could help in the war, but probably not for this particular battle at Winterfell (it'll be too late by then). That will be interesting to see in the episode.
Also, someone else mentioned it here, but remember when Cersei gave Bronn a "reward offer" if he killed Jamie and/or Tyrion? Something tells me he'll show up last minute but actually help them in the fight. He may end up saving their lives again (as he did in previous seasons in different situations).
Anyways, I have to admit though, Episode 2 as a whole was FANTASTIC. Perfect way to set the scene before the war begins and give solid farewells to those who will inevitably die this Sunday.
I can't get over the fact that Jon Snow witnessed this and thinks it's a smart idea to put everyone in the crypts where there are tons of dead people:
Seems pretty stupid
Here is my problem with the crypts. Aren't most of the dead people down their in singular stone crypts? A stone cover of a crypt has to weight several hundred pounds. Is one dead person strong enough to lift the stone cover aside and get out of the crypt? Or does the magic of raising them from the dead just so happen to raise them out of stone confinement?
Are there passageways into the crypt? Because maybe the wights find some way in and we have another scene similar to when the wights attacked Bran and his group in the tunnel.