Yeah, I doubt demographics will really be discussed much, if at all. But I am interested to see if they address the introduction of species that didn’t exist in D&D in 1983, and what the fan reaction will be to whatever they do or don’t say on the matter.
I predict that they will say absolutely nothing, as nothing good can be gained from saying much. Just have them there without making a big deal about it.
Grognard purists will complain anyway, but they won't have a statement to latch on to.
Every one else won't notice and won't care.
Personally, I like that Greyhawk is humanocentric, but that doesn't mean that there aren't all sorts of other non-humans.
I do think that two additional issues, which are unaddressed, are the Drow in Greyhawk, and Orcs (etc.) in Greyhawk. Both of them have been ... let's say ... traditionally coded.
I don't have any particular response to that, as it's something I've been pondering, and I'm wondering what (if anything) they will say about the issue.