If I recall correctly, it's around 90MB.
The new game info is really helpful, btw. Makes it easier to dismiss the games that have stuff disabled that are wanted or not. Apart from that, didn't really notice much with lag or less slowdowns, though I didn't play any 32player matches last night...
Well I'm talking only of SP and the final part with massive battles in the vizari palace I think is really more smooth, I can't believe is a simple placebo effect. Before the patch (one day before ) I'm not tolerate the slowdowns in this part. I don't know if depending to loading directly the level indeed to play progressively.