Sonic and the Black Knight: detail overload
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GoNintendo's rounded up a ton of detail on the now-announced Wii-only Sonic game, The Black Knight, and it apparently included aspects such as online item trading, branching missions and a probable - although unconfirmed - sword-based online multiplayer.
The game's set around the Arthurian legend, and sounds heavy on the sword. It's out this winter. Find a load of scans here.