https://www.polygon.com/2018/8/30/17798328/destiny-2-forsaken-weapons-armor-early-bug

Destiny 2’s first major expansion, Forsaken, launches in under a week. But as of the 2.0 pre-patch update, some players are getting exclusive rewards a bit early. Forsaken-only weapons and armor pieces — complete with random rolls — have found there way into multiple players’ inventories, including our own.

Players have been posting to Twitter and other platforms since the patch dropped yesterday, saying they’re getting items that should not be dropping yet.