The BioWare Blog outlines details on this weekend's Operation RESURGENCE for Mass Effect 3, as they are gearing up for another special event in the action/RPG sequel:

Operation BEACHHEAD eased the pressure on allied planets and freed up conventional forces that were being hammered by the Reapers. With these reinforcements, the allies can use RESURGENCE to target more critical infrastructure.

Anyone who has the Resurgence Pack multiplayer DLC operational during this weekend will be granted a Reserves Pack. A Reserves Pack unlocks one of the new random alien classes guaranteed.

All participating squads will earn +10% additional experience when playing on the Resurgence expansion’s new maps, Firebase: Condor and Firebase: Hydra.