In Update 2.0.4, the most recent patch for Destiny 2, data miners discovered evidence that Thunderlord, an Exotic machine gun from the original Destiny, could be returning. Not only that, but players might be adventuring to the Cosmodrome, the opening area of the first game, to earn the weapon.
According to Polygon, the data miners have discovered Feeding Frenzy, one of Thunderlord's original perks, in Destiny 2's database. The perk isn't currently attached to any weapon in the game, which matches up with an earlier pattern established by Destiny 2's Whisper of the Worm, an Exotic sniper rifle. Whisper of the Worm is a renamed variation of Destiny's Black Spindle, a gun with an original perk called White Nail. The White Nail perk appeared in the data of Destiny 2's Warmind expansion prior to Whisper of the Worm being added to the game.
The data miners also found audio files that suggest a future Destiny 2 update might send players back to the Cosmodrome, further hinting Thunderlord is on its way to Destiny 2. Thunderlord is the first Destiny Exotic weapon ever revealed to the world, shown off during Destiny's E3 2013 gameplay reveal demo. When Destiny launched, the mission was tweaked so that players wouldn't earn such a powerful weapon right at the game's start. However, these data mine leaks could be hinting that Destiny 2 will allow us to replay that mission as it happened back in 2013, and we'll earn Thunderlord just like the Guardians did in that first demo.
Bungie has not revealed whether or not any of this is true, although some players believe that if the Cosmodrome mission and Thunderlord weapon are coming to Destiny 2, it will be a part of the Festival of the Lost, a limited-time Halloween-themed event currently going on right now. As part of the event, on October 30, you'll have access to a new quest line where you can track down Master Ives' killers. Bungie has remained rather coy on what these quests are, simply stating in a blog post that there will be "powerful" rewards.
Destiny 2 is available on Xbox One, PS4, and PC. Festival of the Lost continues until November 6 at 10 AM PST / 1 PM EST / 6 PM BST.