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Found the menu of the full game on a youtube video from Superbot.
The link to the video: http://www.youtube.com/watch?v=xWsTd5UrR3A
I bet you can change Jak's position with any character you want. That'll be awesome!
What could they be hiding in the extras menu?
Extras will probably be like smash bros where you can listen to the music, look at trophies ect.
I really like this, being able to customize the screen with your fave characters just makes it that little bit more personal, i love stuff like that in games.