Though the game won't be shipping with multiplayer, 4A isn't completely sloughing off the single player: "Right now we’re 100% focused on the single player campaign and not thinking beyond that. We don’t like throwing away work though, it’s a project we could potentially return to after Metro: Last Light ships." So… while it sounds highly unlikely, there's still a slim, slim chance that 4A may end up working on a multiplayer component after all.