CNN (of all people) ran an item on upcoming games recently ("Big Video Game Hunt!"), or something like that, from which wily grabbers pinched this 20MB movie featuring extended footage of F-Zero and a little unknown called Mario Kart: Double Dash. Apparently the latter is some sort of Nintendo-themed racing game. We understand it was quite popular when we were children, although we spent our respective childhoods under rocks.
It actually looks very much like the N64 version, but with two characters on each kart, and higher resolution visuals. We'll be interested to play it for ourselves next week.