https://www.gamespot.com/articles/destiny-2-e3-2018-plans-include-playable-gambit-mo/1100-6459407/

Destiny 2's upcoming DLC expansion Forsaken is coming to E3 2018, and now we've learned more about what Bungie has in store for the show. During the Forsaken reveal livestream, Bungie confirmed that the game's new multiplayer mode, Gambit, will be playable on the show floor. Not only that, but Bungie plans to reveal more of Forsaken's story during the event.

Gambit being playable on the show floor is a big deal because E3 is now open to the public, so anyone going to the event can try it before launch in September. Gambit is Destiny 2's much-hyped PvE/PvP hybrid mode where two teams of four fight against waves of AI enemies in their own environment, separate from the other side. Enemies drop motes that you collect and deposit into a chamber of sorts which in turn sends more enemies to the other side's area. At a certain point, one player from each time can "invade" the opposing team's area, putting further pressure on them.