theres many different breeds of both khajiit and argonians, im not sure entirely but im positive some of those breeds are more affiliated with magic than the common ones we see now
it wouldnt be too strange if some of them found their way into whichever game will feature elsweyr/black marsh
although to actually make them playable will pose some difficulties because if they add them, people will expect them in future games where they might not fit in that well anymore
Yeah, it would be so cool if they could do sub-races in the beast provinces. I'd even settle for non-playable, but make them weird, authentic, animal like with proper unique animations and sounds. Another thing I'd love in Black MArsh would be some tribes more violent and uncivilized than others... some that will speak a language you don't understand... and you need to have language skill to be able to undertand progressively from nothing to a fair amount of what they say.