Winninger emphasized that we were getting two returns to classic settings this year, with a nod to a third, and made clear that these were not M:tG settings. He did not, however, say that we wouldn't get a M:tG setting on top of those three. I wonder if Kamigawa is the theoretical extra book @Mercurius has been considering.
Well Magic The Gathering seems to be releasing their own miniatures as well and Strixhaven has some of those already. Kamigawa has(is?) getting some. And some Planeswalkers have been released as well IIRC. So, hey I'm all for Kamigawa really. If not, at least there are plenty of racial options that one can use to represent the various races within it.