Mario Kart was just demoed at the Gamers' Summit with 16-player cooperative play!
The news from Europe about Mario Kart being 16 players was correct. Nintendo has just demoed Mario Kart: Double Dash with co-operative play. One player drives the kart, while the other controls the items and sliding (as well as attacking other players to steal items). Eight GameCubes can be connected for LAN play, and with co-operative play, this means up to 16 people can play (there is an eight kart limit).
Co-op play is a blast, since a lot of yelling back and forth is required to coordinate attacks. Players can switch who is driving/attacking by pressing the Z-Button simultaneously.
Another battle mode was unveiled as well, called "Shine Thief". It's basically capture the flag, where you need to hit the guy carrying the shine. Whoever manages to stay away for a solid minute with the shine wins. Bob-Omb Blast was shown as well, and is still the best battle mode in the game.
PGC will have more news from the Gamers' Summit later today. Check back with us soon!