All I have noticed is that the gameplay seems to be a bit more fluid and the way that people battle for the ball with each other has changed slightly. Also the pitch actually looks like grass on this addition. I believe they have fixed the randomly moving keeper, but have not had a 1 on 1 chip to test this out.
Overall, if you are a hardcore FIFA 10 player then it may be worth getting, but if you are more of a casual gamer just wait until FIFA 11 as all of these features and more will be included in that.