So uh yeah, got to play this game today. Its a rather fun game for what it is, but I enjoyed the first game in this series more...
In regards to the TF2 folks, its an ok appearance. Very disappointed about the original VAs not being in this one, but the Spy replacement voice is okay. Heavy's VA is so-so, and Pyro... well. Its a thing. Their all-star move is indeed Spy, but in a better looking jet than what he usually flies for the actual flight segments, and he can shoot missiles at other players. Too bad for Heavy that the hovercrafts are the worst racing mode - however there are ways to balance out your vehicle after gaining XP from completed races, so there's that.
Its very surreal to play as Spy in stages like After Burner and NiGHTS whilst he's smoking his cigarette and doing his crab taunt sometimes (the cigarette part is rather heavily implied by the gestures of the hand while you're controlling him).
Pic is best I could do atm for Spycrab, it happens randomly so I can only catch the tail end of it...