Angry Birds Go! would mark the second game in the Angry Birds franchise that doesn’t ask players to slingshot birds across the screen at the pigs. The last such game was Bad Piggies, which made players build vehicles to help the pigs recover their lost eggs. That game showed Rovio is capable of making fun games without the slingshot.
The new Angry Birds racer may use vehicles like the BadPiggies game, which would lead to something akin to a Mario Kart game. Using kartswould make it easier to incorporate the pigs into the game as well. Without vehicles of some sort they’d never stand a chance against the birds in a race.