I actually don't like the Echo Six team design. The chicks deserve being called "chicks" because their design is straight out of some weirdo's fantasies (going to war with panties-short shorts? Oh wait, they have camo), Dee-ay looks like Bryce from Neverdead, and generally, I don't like them. I'd love some normal troopers for MP, a unit with variations that equal those between the Wolfpack members.
Also, a stand-alone DLC campaign (rather lengthy missions, couple or three of them), which doesn't connect to the main storyline. Set during RE4, you're controlling a unit similar to Wolfpack, and are on the villains' side again. Possibly a fight with Ada, and Leon. I'd love that too.
And last, but not least, a "Zombie VS" mode, where one team is zombies (switching every match), one team is Wolfpack, and the AI crowd is zombies plus the campaign's enemies with the desert camo (can't recall faction - USS?). The AI zombies would need a damage nerf, so that the Zombie team wouldn't exploit them. Classes should be: Licker, Hunter, Tyrant, Crimson Head, and a couple more. Obviously, they wouldn't have the campaign/AI MP health, since, especially the Tyrants, would be pretty imbalanced.