The Lorewalking story in Patch 11.1.7 centered around Xal’atath has officially settled a long-running community theory: Xal’atath is NOT a fifth secret Old God.
The storyline describes her as a pure void entity, an emissary of the Void Lords rather than one of the Old Gods corrupted by the Void of Azeroth.
In one of the 11.1.7 in-game cutscenes, we see the four Old Gods imprisoning Xal’atath who uses a very basic voidwrath model.

Here’s also a zoomed in version from the screenshot that better shows Xal’atath’s model in that cutscene.

Who is Xal’atath Then?
Some speculate Xal’atath could be the potential world soul of K’aresh, corrupted by Dimensius and the Void.
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byu/Pooty_McPoot from discussion
inwow
We’ll learn more about Xal’atath as the story of the Worldsoul Saga unfolds in Midnight!