Yes, Doom Eternal was supposed to release in 2019, but for the sake of quality, it's been pushed to 2020. If the story trailer above is anything to go by, the wait will be well worth it. And according to our E3 preview of Doom Eternal, that will be exactly the case.
Now the Doom Slayer is taking on Heaven and Hell, determined to rip and tear across every dimension in his quest to end every demon in existence. He doesn't seem to care who or what gets in his way.
Gameplay is an evolution on that of Doom 2016, with more mobility, new weapons and/or weapon effects, and plenty of demons to splatter. The environments are more varied as well, as you appear to move between Hell, Heaven, and other strange locales.
Narrative also seems to be of stronger focus in Eternal. Instead of the story acting as a framework around which demon murder takes place, Doom Eternal will use character and story as supplementary material.
As long as there are horrid monsters to shoot, it won't be any issue.