Mass Effect 3 was widely rumored to have multiplayer of some sort incorporated, though BioWare eventually shot that possibility down. Mass Effect executive producer Casey Hudson, however, is open to multiplayer in the future.
“We haven’t yet come up with a way to do that, so we don’t have anything to announce at this time,” said Hudson. “But, obviously, multiplayer is something we want to do more of in the future as a company.”
As for the possibility of a Mass Effect MMO, “A lot of people say that they want to see an MMO, I think that kind of makes sense for this universe. I think Mass Effect has that quality to it. If you get rid of the Reapers and win that, wouldn’t it be amazing to just live on the Citadel or just take a ship to Omega That makes sense.”
Source: GameInformer
