I have now ordered the art book.
Having read the planeshift article in a little more detail, Wyatt does mention that he limited what regions were in the article to just a single continent, it probably would have been a lot more work for him to include much of the rest of Dominaria. I really would like to get a high definition of the map of Dominaria for a game, much like established DnD settings, I think you could spend years playing in just this setting.
This is why perhaps Dominaria should have been left for a hardcover.