Loki AND the Skrull army
And Thanos is rumoured also, though no trailers have shown him yet.
It's gotta be big to combine the efforts of the entire team. Thanos seems likely. Just read up on the Skrull army...crazy reptilians. Cool backstory!
I have no expectations other than pure mayhem!
Marcus Aurelius: Tell me again, Maximus, why are we here?
Maximus: For the glory of the Empire, sire.
Baked, not fried... the healthy choice.