The Elder Scrolls® Online - The Elder Scrolls Online: Necrom & Update 38 Now Live on PC/Mac - Steam News
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Uncover the Shadow Over Morrowind with The Elder Scrolls Online: Necrom and the Update 38 base-game patch, now live on PC/Mac! This new Chapter in The Elder Scrolls Online saga introduces two new zones to explore, a brand-new class to master, and a sinister plot to uncover that threatens reality itself. If you play on consoles, don’t worry. You can dive into Necrom on Xbox One, Xbox Series S|X, PlayStation 4, and PlayStation 5 on June 20.

TLDR: They are adding two new zones, the Telvanni Peninsula and Apocrypha, as well as a new class, the Arcanist. There are new pve endgame activities and new companions and rewards.