From Destinypedia, the Destiny wiki
GO BEYOND THE LIGHT.
A new power is born out of the ancient Pyramid Ship above Europa's frozen frontier, and a dark empire has risen beneath, united under the banner of the Fallen Kell of Darkness, Eramis. Join your fellow Guardians and bring down the empire at any cost – even if it means wielding the Darkness itself.
The original release date was scheduled to launch on September 22nd, 2020, however got pushed to November 10th, 2020 due to development issues brought in by the Coronavirus Pandemic. Bungie also decided to release Beyond Light on November 10th in order to help Destiny 2 become a launch title for the Xbox Series X and S.
Guardian subclasses & changes