Here are few tid-bits from the demonstration:
? Can pretend to be dead by using Octocam
? Can crawl forward like a looper by getting the hip up and down
? Can take away enemy's weapons
? Can roll around sideways while lying down
? Can use an electric stun knife to stun an enemy
? Can hide from an enemy under a drum like a cardboard box. A drum is more tough and secure.
? Too much rolling in a drum makes Snake vomit
? Not to make him vomit, you can let him browse a magazine with sexy pics (with more pages than before). Pages can be flipped and you can use it against enemies too.
? The viewpoint can be switched to over-shoulder.
? The FPS viewpoint is also available. A crosshairs is controllable by SIXAXIS
? Hiding in a trash can for a too long time adds bad smell to Snake and enemies can sense it
? You can turn off Octocam by shaking SIXAXIS
? Snake uses SIXAXIS when he controls Metal Gear MKII
? Metal Gear MKII is in the stealth mode and it's hard for enemies to spot it
? Can throw a tornado bomb while lying face up.