Parmandur
Book-Friend, he/him
I really hope they aren't planning on putting a bunch of untested stuff in said book like they often do. It's almost always the stuff that didn't get publicly tested that I, at least, am usually unhappy with.
Well, we have books in a row (Wildemount, Theros and Icewind Dale) that put out Race material with no public testing (the Goliath is apparently in Icewind Dale with adjusted stats), and Eberron also had new Orcs that were not tested publicly. It might be that they aren't testing new Race material at this point (they are easier to make than Class options, at least).
Other than Race marerial (or People/Folk/Species, as it turns out in the end: Crawford pointed out on Twitter today that "Species" is a Medieval word, and fitting for Fantasy set with that flavor), I don't expect we'll see any other new player options. Which means, interestingly, if every option other than the two Theros Subclasses gets in (super doubtful), and the new Race approach and material is ~20 pages or less (likely, given comparable examples), then the new book will have a players option section about the same page length as Eberron.