Bad. Not only is it off the Wii (seriously?), it's download only.
Now, I can't say I mind a Mega Man 9 sort of deal, but why limit Sonic to such a small audience? Shit, take a good look at NSMB Wii. That's 2D Mario tearing up the sales charts. Sonic was once up there too, a worthy competitor to Mario (in the west, somewhat, anyway). 2D Mario is lookin' around, wondering where his rival went...
Give me a new 2D Sonic worth my $50 (yes, that's full price). It's not an impossible task, is it? I mean, seriously - even the latest 2D Wario on the Wii is approaching 1mil, and Wario is no Sonic...