The Vex Invasion quest is live, sort of. Here's how to start up the quest in Destiny 2 which asks for an Eyes on the Moon requirement, among other initial steps.

In Destiny 2: Season of the Undying’s new Vex Invasions, they can tranform into a new Heroic mode. Here’s how the event works, and how to tell if a Vex Overlord is about to spawn.