I scrounged up some new info, it's looks like a sequel to Secret Rings because he's in a book like Sonic's first Wii outing.
Sonic returns to the Wii™ on a wild ride through a storybook world of Arthurian legend in his all-new adventure, Sonic and the Black Knight™. Designed exclusively for the Wii, Sonic and the Black Knight brings a new twist to Sonic gameplay by combining Sonic’s legendary speed with frenetic swordplay action that makes full use of the unique Wii control system.
In this strange, enchanted medieval world, Sonic wields a sword in his effort to save the day. Encountering many friends and foes along the way, Sonic shows them what it takes to be a true hero and the ultimate knight. Master the sword and unravel the mystery behind this intriguing adventure…
Check out the September issue of Nintendo Power for the full scoop on Sonic and the Black Knight!
This could all turn very bad. It's like, "Oh, let's take Sonic and stick him in a game where he can pretend he's Link." Yeah, that's what it feels like. And I do keep thinking it's gonna be just like when they made the Shadow the Hedgehog game. But maybe we'll be lucky and it might actually be decent. I guess I can always give it the benefit of the doubt. But I'm almost afraid to.