Elder Scrolls 6 Setting : Comparing the Trailer to ES Online

I examine the Elder Scrolls VI trailer and compare what is shown there to parts of Elder Scrolls Online to try to figure out where ES6 might be set, with special emphasis on two theories that seem to be big here on UA-cam:
FudeMuppet's video suggesting High Rock : • ELDER SCROLLS 6 - Pote...
-and Camelworks' Hammerfell theory video: • Elder Scrolls VI: Hamm...