roslin would be the most obvious way of revealing the final model - and probably the easiest to write, seeing as theyve spent a fair amount of time building up to that - which makes me suspect that they wont actually go down that path.
i still say that galactica herself is the final model though - it makes far more sense, at least to me.

having said that, id put money on either lorne green or barry van dyke... ;)