That would be the worst business decision ever at this point. I have a theory bubbling in my head as to why this is PC exclusive. Sega doesn't have the resources or the time to make this game a AAA next gen HD title so they are developing it for the PC where the standards are lower and they can create something comfortably in between this generation and the last one. just a thought.
In a perfect world though this would be coming for either 360 or PS3 (exclusively, doesn't matter which. I say this because when a game is created for both consoles, the development is guaranteed to suffer some how. It's always best to optimize a game for a single console. They could port it later though.) and would be powered by the hedgehog engine.