This game is better than the first one in every way, and that is saying a lot since I really liked it. It really feels like you are on a battlefield. The first game had a satirical overtone to it, this one seems to be of a more serious tone. Once the controls are smoothed out a little bit, this is a potential game of the year for 2010. I may go pre-order this already.
EDIT: That game mode looks great!
4 squads competing against each other? Sick.