The Banjo-Kazooie series was arguably the best and definitely one of the best on the Nintendo 64. With acclaim and praise coming from nearly everybody who played them, can you really blame Rare for bringing it over to the next console, GAMECUBE?
Okay, fine, the game hasn't been officially announced yet. But with Gruntilda's mention of Banjo-Threeie at the end of the last game, and a particularly interesting demo of Banjo-Tooie characters on GAMECUBE software that was shown at Nintendo's 2000 Spaceworld, it's a nice indicator that Rare will eventually bring Bear, Bird, and... er... Jumbo to the 128-bit powerhouse that is GAMECUBE.
2000 Spaceworld Demo