I'm with you. The trailer is a disappointment. B-K is a platformer, not some Vigilante 8 or Twisted Metal clone. I don't want vehicles -- I just want more classic goodness. B-K is one of my top three favorite games (behind Deus Ex and Zelda: OoT); I hate to see it get mangled. I don't have confidence in Rare, considering everything they've put out on the 360 has been shit, Viva Pinata not included. They're hardly brilliant any more, which hurts, since they're my favorite video game developer by far. I'll buy this on day one, but I hope there's more platforming than what I saw in the video. Or, alternatively, that the vehicle aspects aren't as corny and "gummi ship-esque" as they looked in the trailer.
To be honest, though, B-T was a pretty bad game (ripping off DK-64) in comparison to the first, so I wouldn't be surprised if this one sucked too. One can hope, though...