Games often don't have demos when they come out as it can actually reduce sales when people play the demo and decide not to buy for whatever reason. I'd guess they will both get demos in a month or two, especially LBP.
I'd love a demo for every game. Problem is they aren't as simple for developers to create as people assume. It's not just a matter of plonking a load of existing files on a server and having people download it.
Games often don't have demos when they come out as it can actually reduce sales when people play the demo and decide not to buy for whatever reason. I'd guess they will both get demos in a month or two, especially LBP.
i'm thinking they have demo's running of most games at shows that the public can try, why not just upload those for others to try?
As I said before, anything on the XBL Marketplace or PSN Store has to meet strict criteria set by MS/Sony.