I think Nintendo should re-release KI or KI2 for GBA. KI1 would probably be the better choice, because they could really beef up the graphics on the GBA. And I know the game originally did very well on SNES. And Rare really hasn't done anything major after Conker flopped, so maybe something like that would be good for them. I think it would be cool to play it again on GBA. It would look more like the arcade.
"I'll get those plumbers!" -Bowser
King Bowser Koopa