If I had to make educated guesses, I would make the following on who lives and dies. I don't expect them to be 100% right, because this show always throws us unexpected curves. But the way things are looking right now, here's how it looks like it might turn out from where I sit.
Walt = Dead
Jesse = Alive
Skyler = Tossup
Flynn = Alive
Marie = Alive (if we even see her again)
Jack = Dead
Todd = Tossup
Lydia = Tossup
Saul = Alive (if we even see him again)
And, of course, Gus, Mike, Gale, Jane and Hank = All revived by Phoenix Downs to aid in the battle against Sephiroth.
Even though it doesn't seem like Todd or Lydia could survive the coming rampage, I don't think I would write either of them off just yet.