Confirmed by Casey Hudson over Twitter, the wellspring of all that is true, multiplayer co-op missions are a feature of the upcoming Mass Effect 3. We look forward to blocking doorways as the timer counts down and pure, raw rage flows out from the other side of Xbox Live. Kotaku has the story.
So, if one person starts walking off into the sky, can the other pull them down? That would have been real helpful in ME2. I got such great views, being stuck in the ceiling.