I saw this coming a mile away, although I was leaning more so towards Clem bring the one who was bitten instead of Lee. Still, I don't even think this is going to be a 'bittersweet' ending; just bitter. Or maybe it'll depend on how many people you got to agree to help you. The more the better(similar to ME2's end run) I got everyone available. My a$$hole Lee on my second play through is fukked, though.
Don't really see anyone outside of one or two people surviving this(if that). This
is the Walking Dead, after all, so it wouldn't shock me in the least if everyone dies in the end. Speaks volumes about how good the game and series as a whole is that, even though you know death is most likely around the corner and every character you've grown accustomed to is going to die in vain, you still tune in for the next episode.
Oh, and Christa is most def pregnant. Throwing up, and getting emotional over the abortion tape?