A feature that we’re fairly certain will be included in the game to some degree is house building or town creation. Skyrim introduced the idea of designing and maintaining a homestead with its Hearthfire DLC, which Fallout 4 expanded upon with the introduction of its settlement mechanic and the Elder Scrolls online built upon again with its Homestead DLC. This leads neatly into a further expansion of such features in the next Elder Scrolls title as it felt not-quite-finished in Fallout.
It would be a feature that would actually fit in particularly well with the rumored Valenwood setting, if it involved the player adapting to the wilderness in the way the resident Bosmer have with their treetop cities. In a similar way the player used debris and junk to craft their settlement in Fallout, they could use their natural environment to do so in Elder Scrolls in a nice contrast.