https://www.pcgamer.com/the-guardian-finally-speaks-in-the-destiny-2-forsaken-launch-trailer/

Destiny 2: Forsaken is now just one week away, and today Bungie began the countdown with the rollout of the D2:F launch trailer. It begins with a recap of the events leading into the expansion—the "Last Stand of the Gunslinger"—before moving on to a closer look at the man responsible, and a hard conversation about what's to be done. 

The quick version is that Cayde-6 is dead (unless he's not), Zavala is stoic, Ikora is bombastic, and since the guy who normally makes things happen is lying on a slab, it falls to you to set things right—beginning with an ominous, wronged-hero growl of, "He's mine." And yes, the Guardian speaks! First time for that in Destiny 2, although it did happen once in awhile in Destiny—and while the voice in the trailer is male, it's fair to assume that female voiceovers will be offered, since that was an option in D1.