It'd be awesome to see a new Star Fox game. Then again, it could be another nightmare to see a new Star Fox game. Assault and Command were horrid, and the new Kingdom Hearts-style for the characters ruined the style for Brawl. (Though, Command's style was pretty bad itself.)
They need to get someone other than Rare (which won't be happening, since Microsoft took them hostage with Bungie), Konami, or Namco. They all make pretty bad games nowadays (except Rare, who was pretty good), and have killed the quality of the series. It should be developed by Nintendo, I'd think.
And the next game certainly better not have another Andross revival.
Another great series that really needs a new game is Kirby. Whatever happened to that GameCube and Wii game that's loooooong overdue?
Edit: Why'd I list Konami?! XD