Standard 800pts for 4 maps, although one of the maps is apparently only sized for 1v1 or 2v2.
I've only played one match on each so far (along with a solo runthrough of each), but I'm really digging Broadcast. As for the others, Creep is basically made for snipers, something I never do, and while I appreciate the map I know I'm not going to be looking forward to playing it. Chinatown felt a bit more confusing than anything else. Everything looks kind of the same and there were points I had a hard time distinguishing an enemy from an object. Of course, this could totally be chalked up to inexperience with the map. Thankfully, it does have plenty of labeled buildings (fish market, dim sum... pirated DVD shop?) that will make for quick identifiers in team games.
I'd like to put some more time into the maps but my wingman keeps encountering error messages while trying to download. I reckon there's a hell of a lot of downloading going on right now. <---- CONFIRMED.