I can see them having Nokia Theater and/or Club Nokia again. If it's a question of cost, I think I've heard more than once that Hall G actually cost more for AX to rent out because of the need to build out a stage and sound system, test the acoustics and build out the seating. We'll have to wait and see whether AX does make use of the facilities I guess.
My wish list of GoH is short and contains mainly musical guests: KOTOKO, Mami Kawada, Houkago Tea Time, Nana Mizuki
Anime Los Angeles
Potential Future Crossplays
Maki Nishikino (Love Live) - Summer school uniform