Before BioWare added co-op multiplayer to Mass Effect 3, it had experimented with a different multiplayer effort. Mass Effect Team Assault was in development at BioWare Montreal in 2010, and it was going to be a standalone first-person shooter.
The team was to "create a standalone multiplayer experience in the Mass Effect universe that would mix the play styles of Unreal Tournament and Battlefield 1943."
BioWare was aiming to make it a downloadable title, Geoff Keighley's The Final Hours of Mass Effect 3 reveals. The new iPad app (via Kotaku) details how Team Assault was in development for four months, before it turned into the co-op mode for Mass Effect 3.
In addition to first-person shooting, screens from the app show that vehicles like the Mako and Hammerhead would have been playable. Given that the Mass Effect franchise will continue long after Mass Effect 3 DLC, will BioWare ever return to this concept?