The Mass Effect Series Producer has let the cat out of the bag so to speak about Mass Effect 3's multiplayer component; the first game in the series to have this gameplay option.
Casey Hudson, who doubles as the Mass Effect 3 Project Director, has now begun to speak a bit more about the decision to go with a multiplayer option. However, he has yet to reveal whether the multiplayer mode will be team deathmatch or co-op or perhaps something else entirely.
Hopefully more information will be revealed as we creep closer to the 9th March 2012 release date.
Source: PC Power Play