New companions in act 2 would be an awesome suprise since right now I'm convinced we won't get any.
Other than that, I mostly hope we will be able to go back to the act 1 area.
About act 2 itself... I don't know if we'll gain access to Baldur's Gate, I'm not sure we will but it's more than possible. If not, we'll probably get some form of civilization. Hopefully some recognisable places like Baragoset or neeshkal. I would even welcome other landmarks like candlekeep or the friendly arm's inn
