Free Multiplayer DLC update is coming out next week.
It includes 6 new classes, at least 3 new weapons and new maps.
These are actually the items confirmed in a previous leak - Geth Infiltrators and Engineers, Batarian Soldiers and Sentinels, Krogan Vanguard and Asari Adept-Justicar.
I personally cannot wait to get my hands on a Geth class (that shock AoE looks like their Heavy Melee, and they have the Quarian bunny-hop dodge), and new maps will be a very welcome change of pace. The Batarian OmniTool also looks different from the ones we've seen so far, which is pretty cool. And last but not least the new Krogan finally has a helmet!