Mario Kart 8? Better yet, wanna test drive a Wii U? GameStop will have playable demos of the game at 2,700 retail locations in the States between 12-4PM on May 17 and 18 (this weekend). Those who show up at the dealership for the test drive and decide to pre-order the game will receive a double-sided poster.
Specific locations for the event can be found on the GameStop site. The game will race into retail and the Nintendo eShop on May 30.