there are some new graphics visible, like new boots (Adidas Predator PULSE, Adidas F 50, Adidas Predator Lunar -> not sure, Adidas Supernova -> not sure), new kits, faces and hairstyles.
There are also more licensed teams with original kits, badges, players and names.
The gameplay has been changed a lot by KONAMI: Beside the "standard-changes" you can experience many new animations (about 20-30 new ones) and an improved passing- and shootingsystem. Passing is faster and more deadly - also the shooting. There are much less handballs and the players run more natural now!
The systemrequirements have been set down a little bit, so that there are less "Slow-Motion"-problems now. As a result it can happen, that people who had troubles with the Slow-Mo and PES 3 will now be able to play the game completely smooth.