According to a Tomb Raider listing that was posted on GAME’s official website, the upcoming Tomb Raider game might include a multiplayer mode.
The listing’s description has no been removed from the website, although All Games Beta managed to capture a screenshot of the listing and it showed the following:
Survive as a Team: Play a variety of multiplayer modes as Lara’s Shipmates or Yamatai’s Scavengers.
To my knowledge, this will be the first Tomb Raider game ever to include any sort of multiplayer mode. Considering other third-person action games have included their own multiplayer modes such as Ninja Gaiden 3 and Assassin’s Creed 3, it’s not far-fetched for Tomb Raider to have it too.