https://wccftech.com/doom-eternal-update-6-66-to-release-next-week-will-include-horde-mode-battlemode-2-0-and-more/

A new DOOM Eternal update will go live next week, bringing a new play mode, an updated BATTLEMODE, and more.

Update 6.66, which will go live on October 26th, will introduce the all-new arcade style Horde Mode, BATTLEMODE 2.0 with a new arena and streak-based rewards, two new Master Levels, and more. You can check out a short teaser for Horde Mode below.