They aren't going to tease Abby in any way. I think there's a small chance we get some kind of scene with Jerry, but considering there's already a scene between him and Marlene in
Part II that Abby is part of, I think it's entirely likely that we only see Jerry in the same spot we saw him in
Part I, and we don't see or hear about Abby at all this season. Also doubt that Jerry is credited or referred to as anything other than "surgeon" (in the credits, etc.).
Remember, Jerry (or, rather, the surgeon, since we didn't know his name at the time) having a daughter is something that wasn't known until we learned it while playing
Part II. The speculation about who the hell Abby is and why she does what she does to Joel is going to be as important to season two as it was to
Part II, and they aren't going to try to give show-watchers even a small clue that she exists before they need to next season / in the trailers for next season.
Definitely gonna kill the woman who lost her ear in Ep 1.
I'm going double digits.
I'm confident that she's going to be the person who Marlene tells to escort Joel after he wakes up. And then, yeah, he kills her.