Amiibo lets Nintendo brings Skylander style NFC figures to WiiU for games like Smash Bros and Mario Kart.
The figures, such as Mario, connect with the WiiU gamepad and store data about your character as you play. Therefore, each Amiibo is unique to the player and will affect how they play Super Smash Bros WiiU and Mario Kart 8.
An adapter is also in the works for the Nintendo 3DS that will release sometime next year. Until then, Amiibo functionality will be included in Mario Kart 8, Captain Toad: Treasure Tracker, Mario Party 10, and Yoshi’s Woolly World. How they will function within those titles has not been stated, but more information will come.
Here is the clip from the Amiibo section of the Nintendo stream from earlier today: