I mean, what else is gonna be "bigger" than RDJ as Doom?
I'm already expecting to see Chris Evans (even though I don't want him to return until Secret Wars), maybe ScarJo's chair. Rumors and speculations ruined those as surprises.
Josh Brolin back as Thanos? Would feel as a disappointment, as great as he was.
A little early for the multiverse casting yet as well. I'm expecting Tobey, Andrew, Hugh, Reynolds and the X Men showing up until Secret Wars. Maybe at the end of Doomsday as a cliffhanger.
While writing this, I see Wyatt's chair. Now, that was unexpected.