https://www.gamespot.com/articles/wow-is-finally-adding-a-new-endgame-activity-made-with-smaller-groups-in-mind/1100-6518919/?ftag=CAD-01-10abi2f
Delves are a new form of content coming in The War Within, built for 1-5 players.
Didn't they try to do this, like, twice already? First with island expeditions, and then Torghast, both of which were very much just chores. Third time's the charm I guess, but I do not have high hopes.
Also with the Horrific Visions system.
I suppose the key difference here is it's a parallel progression system that gears you up to Heroic raid level, whereas Visions and Torghast were the only way to upgrade your legendary. Solo/duo/trio players get a new way to gear, or it's an option to dip into if a given week's prefixes aren't friendly to their M+ group, for example.
So just delves from ESO? i mean, sure? its not gonna get me to come back, but cool i guess.