I don't want to give anything away, but if you are a fan, you should really enjoy this. The F/X, as we all know, are wonderful, but I really liked the storyline also. Although some of the lines are a little trite, it's really got a lot going for it. I will have to see it again at least twice to make sure I get all the details.
Just a note, STAY THROUGH THE CREDITS! There is a preview of the Matrix Revolutions that is worth the wait.
I should also say I am a freak fan about this trilogy, having seen the first one more than 20 times.