Thanks to my awesomeness I have read the issue of Nintendo Power featuring the game:
The game looks pretty nice, think of it as a prettier looking version of the Wii version of Unleashed, the two zones that were featured were Sweet Mountain zone, and Tropical Reservoir zone, and the former is a mountain of pastries, the said they wanted to include the crazy level designs from the old games, which is fine by me. It also said that in the 3D sections it will focus more on running from A-B akin to the Daytime stages of Unleashed, while the 2D sections will be more for platforming.
The DS version, can easily be called Sonic Rush 3, it looks exactly like those games, even the tension gauge is there, they said it would be similar to the Wii version.
Tails appears in the story but Sonic will be the only playable, they said the story is simple, light, and goofy, which is fine by me. Knuckles, and Shadow may also make an appearance in the game.
If someone has scans, please show them, because seeing it, is better than me explaining it.