For starters, the Wii U GamePad means you no longer need a Mario Kart Wii-style Wii wheel as you can steer with the Wii U controller.
As for the GamePad screen, you'll be able to see the race leaders on the GamePad while a mini-map is also be displayed on the screen.
The GamePad comes into play when you use a power-up. For example, one power-up is a remote-controller car packed with dynamite; thanks to the GamePad, you can see it fly through the course before smashing into its target.
The new mini-games also make use of the Wii U controller. Super Monkey Ball Arena puts one player in charge of AiAi in his ball on the GamePad while other players use their Remotes to drive around as Sonic and Tails in small racing cars. The aim is to roll into and squash Sonic and Tails as they attempt to grab as many bananas as possible.
Are you looking forward to Sonic And All-Stars Racing Transformed?
[ Source: IGN ]