A while ago on Reddit, there was a discussion about the "upcoming edition" of D&D, and people were quickly divided into two camps.
One group insists...
The other group insists that they are going to bundle all of the 5E books into a revised set of the core rules, and call it "the Deluxe Edition" or something. They insist that this new book will just be a reprint of the core rulebooks plus the added material from Xanathar's, Tasha's, Fizban's, and so forth. This camp insists that we've already seen everything that they are going to include, and it's intended as an item of convenience--a way to have everything neatly in one place. Most of it was wishful thinking as well, in my opinion: some people genuinely want 5E to be the elusive 'evergreen' edition of D&D.
Obviously, the new product will fall somewhere between the two camps. But it sounds like it'll land a lot closer to Team Evergreen.