A now-deleted Bethesda Store listing for DOOM Eternal: The Ancient Gods Part 2 has given us a rough idea about the game's setting, weapons and aesthetics. It will feature a new weapon called the Sentinel Hammer, and at least five new enemy types. Additional DOOM Eternal DLC seems unlikely, as The Ancient Gods Part 2 is expected to end the game' storyline.
https://www.notebookcheck.net/Here-s-our-first-look-at-what-DOOM-Eternal-The-Ancient-Gods-Part-2-could-have-in-store-for-us.526824.0.html