Moonrise Towers has been confirmed as the finale of Act 1, I believe.
No that belongs to Act 2 roughly level 5-6 stuff. At least what someone had mentioned if you google. Perhaps at act 1 we could arrive there but to do it finish it is act 2.
Oh and even if we do that it does not mean we could not arrive to Baldurs Gate city. I am not saying we arrive at the city or not. I am saying we do not know that information.