We ran into a good bit of things.
First off, modern GHZ and modern Sonic's assets are in the folders, so it's not unlikely at all for this thing to later unlock modern Sonic's GHZ stage being playable. The greatest part? That is not all. The entirety of City Escape is in here too. That pretty much means we may get to play CE before the game's release. This also means that Omochao, the GUN robots, the giant fish from GHZ and everything is also inside the demo's files.
Some other things (put in spoiler tags):
Not gonna post pictures for obvious reasons (at least until stuff has simmered down), but just take my word on these things. And no, we haven't found a level list yet. If interested, keep this topic on watch. We may find more interesting stuff in the meantime.
Edited by Azukara, 27 October 2011 - 04:22 PM.