http://www.gamevideos.com/video/id/9860
This shows off the entire demonstration, some really cool things here...
- the game will be downloadable sometime this year, while a Blu-Ray retail version will be available next year...they will include a bunch of the best user-created levels on the Blu-Ray version
-there looks to be a user-created level 'universe' where you can navigate through your friends levels, the top rated levels, leave comments and such, not unlike YouTube
This could be a game that keeps on giving...the advanced physics make the possibilities of mechanics almost limitless, and with players making their own levels, we'll see a crazy variety. This is something I could see myself messing around with for a loooong time, it looks really cool.