@OB1 I wanted dto apologize if I came off as grouchy about the PHB extension idea before: I don't think it will happen, ever, but I'm sorry for being a bit forceful about it.
In the bee YouTube videos today from D&D Beyond interviewing Jeremy Crawford, he wanted to emphasize that these options are not Errata to the PHB, and are designed with the purpose of not supplanting them, and being useable alongside each other. The way he talked made it sound very much like this is all for a book. What's more, he indicated that they are done with Subclasses for the time being, and that the variant options cap off the PC rules on existing Classes for the purposes of whatever product is in the works. Given that, and the small amount of rules tested in terms of page count (the words per page match what is in the printed books, though art will extend it slightly, we are still talking a fraction of a book). I'm still leaning heavily towards Setting book.