A lot like Morrowind or Elder scrolls online. Something along those lines?
Converse with fellow players
I would put it more along the lines of Dragon's Dogma Online where it isn't "fully" open-world as in you will encounter other players but that there is a map and areas you can explore with a party and find quests/tasks to clear and complete. I would also compare it with Warframe's "open-world" maps like the Plains of Eidolon, Fortuna, and Deimos where it is a larger area to explore but is still largely instanced outside of a few small cases. In the New Genesis streams they have shown that you can meet other places in the open field and simply recruit them to your party before entering Destiny-esque dungeons.