Battlefield 3 Premium members with a PS3 have been enjoying the Close Quarters expansion for a week. If you're a PC or 360 guy, the content is now available for you as well, assuming you've signed up for Premium. If not, you'll have to wait another two weeks (or one if you're on PS3).
Interestingly, on the PC side there's still no hard limit on player count, so you'll find some admins running variants of 24, 32, 48, and even 64 players. DICE officially recommends 16, but the option is there, and should prove fun for some of the larger maps.
16 Players is recommended. If Server admins on PC want to roll 64, go ahead. We´re not supporting issues over recommended size.— Daniel Matros (@zh1nt0) June 12, 2012
Hit up Origin or Xbox LIVE to grab the update and get playing now.