*weighs in again on the Anders front, because, hey, I've got time and repeating myself is so much fun*
1. Being a Hawke companion doesn't mean you have to stop being a Grey Warden. I believe I even read somewhere that there is a Grey Warden quest.
2. He CAN die, but his death is ONLY an epilogue death, and DG has said that can be easily explained away.
3. There are time-skips in the game. Kirwall is quite close to Amaranthine (if you look at a map of Thedas). Both are port towns. There's no reason why Anders can't hop back and forth between the two cities a couple of times during the TEN YEARS of gameplay we're going to get!
4. It looks a LOT like him
5. I want it to be him, so I'm allowed to be hopeful and logical and self-delusional all at the same time