The Resurgence pack was released today, and while I understand there's still some internal server issues preventing the new Weapons / Characters from being available, the new maps are already accessible, and folks are already playing and discussing them.
However, I can't seem to create a new game on one of the new maps, and setting it to random didn't make it turn up either. The content's there, so how do I access it?
Best Answer
Despite needing to update Mass Effect 3 to run it, that patch was not the patch containing the Resurgence pack (as I had assumed). If you'd like to use the new maps (and eventually, weapons / characters), you need to actually access the DLC via "DLC" from the main menu - you can then "buy" the DLC for 0 BiowarePoints, afterwhich, it will install and be available for use in multiplayer.
Kinda convoluted, and not intuitive at all. (Especially since it's free - why not simply patch the game to add the content if everyone gets it?)