So I guess we hit our peak in terms of having the most variety in an Elder Scrolls game true to its lore with Oblivion.
Oh, well. Wherever we go next, though, I hope their lore on that place doesn't involve yet another 'humans are the majority as well as in charge again yaaaay.' Bethesda is a business, so I'm sure they're aware of the 'the biggest market is white males' rule, but that shouldn't stop them from making their visions of Nirn a reality.
At least, that's what I think.
Well we've already had Cyrodiil, High Rock and Skyrim which are the three provinces where white males are the most dominant.
You can argue about whether or not we had Hammerfell which is mostly black males, we've definitely had Morrowind so that leaves us with:
Black Marsh: Primarily Argonians. Difficult to make however because most races can't access the middle of the province without dying...
Elsweyr: Primarily Khajiit (would love to see this)
Valenwood: Bosmer, direct part of the Aldmeri Dominion however so hard to have anything but Khajiit, Bosmer or Altmer
Summerset: Altmer, see above
or arguably Hammerfell.
Regardless a new province will not have white humans as it's primary population group.