Dusk Golem
A 21st Century Rockefeller
I think they stopped using teams. The only reason they had teams was to get different Wii and PS3/360 Sonic games. They don't have to do that here.
I actually think they are using teams. They had three different teams, at least before Colors released. The 'Mario & Sonic' team, the 'Storybook' team, and the 'Unleashed' team. SEGA struck a three-game deal with Nintendo, the first of which is a Mario & Sonic game, the second of which is what looks to be essentially Sonic Colors 2, and a third unannounced one, which I will bet like how this game seems very much in the same vein of Colors the third game will be to Unleashed and Generations.
It makes the three-game Nintendo deal timely and sensical if they had three different teams working on each of the three different games, and the style of the two games shown so far fit with the team motif SEGA deliberated on in at least 2010.