G4TV: God of War III Demo Full Preview | PS3Blog.net
This is the same demo that was shown at E3, but this is the whole demo. They cut it short at E3. So you can just skip to the 6:00 minute mark.
Be forewarned it’s extremely gory, so it’s not for the weak at heart. A guys heads gets ripped off in extreme detail. Man this mans looks epic! Must have it.