As a side note: I remember people theorising that it would be subtitled Redfall, since Bethesda had trademarked the name around the same time.

I also remember Todd later saying in an interview, after lot's of speculation, that they had no idea yet for the game, basically debunking any speculation as just that.

I also thought the rumor was on trademarking "The Elder Scrolls: Redguard" or something, which is easily explained as just an old spin-off from 1998 that they likely had to settle some stuff for. Besides, all game titles have been prime location. I think the word "Redfall" was a different rumour than the trademark one.

An old Twitter post suggested Highrock which also matched the trailers look. However, the next ESO chapter became Highrock and they never went back in a main game before, obviously ignoring Arena. So it may have just been about that. An apperantly leaked internal note spoke of project Greenwood, possibly setting it in Valenwood (second most rumoured place) but that is alleged.

In the end, Bethesda still has us talking and speculating, and has me writing 4 paragraphs, with just releasing one shitty 5 year old trailer. And that while, as I said at the start, pretty all rumours where debunked as "we don't know yet". Damn they got me. They still got me...