Update: Nintendo of Europe has clarified that Luigi's Mansion 2 is not multiplayer, and that the game's information was updated incorrectly. Our original story continues below.
We're all looking forward to the opportunity to bust ghosts in Luigi's Mansion 2, but we may not need to do it alone, as the game's official information page lists a multiplayer option.
Luigi's Mansion 2 at Nintendo Europe lists it as a one or two-player game, though there's no further information about how the multiplayer would work.
We played the game after E3 and very much enjoyed it, as our Luigi's Mansion 2 preview details.