It's a new trailer for Doom Eternal. 'Nuff Said.
DOOM Eternal key art 3

You want a new trailer for DOOM Eternal? You got it. This trailer offers up a look at the new enemies like the Marauder and Gladiator. You get a look at new glory kills. You get a look at the awesome power of the Crucible weapon.

Doom Eternal will be out on March 20, 2020 for the PC, PlayStation 4, Xbox One, and Google Stadia. A Nintendo Switch release will be released "at a later date."