The inclusion of 360 degree dribbling makes the game more precise and like the real game than ever before. The new control mechanics allow you to move anywhere on the pitch with precise controls.
The addition of EA's Game Face technology will allow you to put yourself in the game. EA have also implemented new motion capture and animation techniques to give your defenders and goalkeepers a greater degree of options when the ball is in and around the penalty area.
EA claim to have spent 70% of their development time refining the gameplay in FIFA 10, so expect the final product to look similar to the 09 edition but play totally differently.