Sanji + co. will lead big mam out.
but that leaves Admiral, marines, CP0 and all of the Donxiquote pirates.
To go against them are:
-2(?) revolutionaries both hinted to be super strong. I'd wager that Sabo's stronger than Vice Admiral and almost admiral level; since Ace was second corp captain and sabo was almost his level, and that was 2 years ago.
-Gnome army + toy soldier
-Franky, Ussop, Robin
-Luffy, Zoro, Kinemon
and potentially every toy/defeated fighter.
The major obstacles would probably be doflamingo and the admiral.
@Galaxy:
Why's that? Oda might not want to show his new design yet.
Leaving it for new years probably. Gotta love him, he does have a flair for the dramatics.