Its is hard to speculate on completely new villains. But those posted were one dimensional monsters (Chromatus, Galakrond), Alternate dimension nazis I really don't want (Yrel and her light fanatics) or First Ones there would completely go against the wishes of the community for a more grounded expansion. Sure if they create a completely new villain (as opposed to an iconic villain as per the leaks of Scaleface) that can work. But out of the already known ones I would prefer these three. They are cool, they are alive.
Galakrond and Chromatus could be done as simple monsters. I think Chromatus did have some personality in the book and they could work on that. As for Galakrond, if he is just a big dump dragon then the personality can be on his handler. Could be an entirely new character. Could be someone we know.
Hey, could even be Odyn.
Until we get a screenshot of the place the 2 images were taken on I believe its a new zone, also Reddit mentioned it being Zandalar? But the Zandalar rocks are a different color and jungles a different shade of green IIRC. At most out of the BfA zones it would be stormsong
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In human form? I dont think so, for several reasons: every dragon in human form that we saw has no tail, also, putting a tail on a straight humanoid looks weird.
They would need to either curve the spine like Draenei to turn the butt up (so the tail doesn't point straight to the ground), or the put the tail on a 90º angle from the spine and it looks anatomically wrong (as if the tail is just glued to the back intead of beaing a prolongation)