http://wiihdrumors.com/we%e2%80%99re-not-afraid-of-a-little-coffee-stain-says-sony-employee/
SHOOTS GONNA GO DOWNNNNN
Also,
http://www.freepatentsonline.com/7929911.pdf
CARTRIDGES, MULTIPLE GAMES ON ONE CARTRIDGE, F-ZERO, MARIO KART, CONFIRMED FOR Wii 2