No idea, who knows, but stuff like this will always continue to leak.
Going back to Sonic the Hedgehog 4, after what I've seen, I am convienced this game is going to be a raging success and probably one of the biggest hits on the XBLA and PSN platform, despite what SonicRetro, Sonic _____, NeoGAF etc would have you believe declairing this is the end, from the looks of things, I think a lot of people are going to try the first level, love it, then continue on to purchase the full game, especially since it's only for $5, or even if it's only $10, I would imagine quite a few would purchase it.
Shame, because I think this would indicate to Iizuka that the Casino Street gimmick and the mine cart level as what fans want in future releases.