That's kind of the strength of Olmos, I'd be really sad if they killed Bill Adama off because Olmos is really why I decided to watch the show in the first place (pre-release press didn't impress me, but I think Olmos is a brilliant actor and have watched many things just because he's in it and he's always worth watching, of course with BSG I got hooked on the whole show in half an ep).
Baltar is a possibility, there were some indications during the preview that Baltar could get killed/ be a cylon. That would also be major. One way or the other sure to be interesting.
Olmos was amazing tonight.