Too many questions. I think (and hope) it will be a tournament once again.
Yeah, Raiden fighting for dominionship of Outworld. Maybe he'll be Grandmaster of the tournament considering he's leading the assault?
Does Earthrealm still need to win 10 consecutive tournaments to claim it?
Netherrealm revenants, led by Liu Kang, to come back and also look to conquer other realms, including Outworld.
With Empress Kitana's influence, whoever's side they are on, Edenia should be on their mind too.