User blog comment:Atvelonis/E3 2018 Coverage and TES VI Teaser/@comment-1600847-20180611203626/@comment-26893431-20180611221604

I strongly think it's Hammerfell, here's why.

First, the sea to the right; could very well be the Iliac Bay, one could point out the sun, but then again, might be at sunset. Second, there is a mountain range in the distance, matching the appearance of the Dragontail Mountains. Third, the hole in the ground? Most likely the crater at Azra's Crossing created by Azra Nightwielder. Fourth, the vegetation, sandy and light, with a handful of what appear to be acacia trees; Savanna; Hammerfell. Fifth, the stone structure? The color and architecture match that of sandstone and Redguard architecture.

Granted, I don't think they'd do Hammerfell without High Rock. Or at least, they won't do High Rock without Hammerfell, as High Rock is, relatively, very small.