I see dragons like the Akatosh Mount mod. Instead of levitation.
Would you bend over and let someone ride on your back everywhere as you crawled on all 4 ? Even more so if you were more intelligent than your rider and could rip your rider apart, chew him up and spit his intestines along with a ball of fire ?
I most certainly hope there will be no dragon "mounts" and I hope there will only be maybe 2 dragons, 3 at max, best of all would be just 1 dragon but the teaser said "they have returned" they being a plural word and not a singular, so there must be at least 2 dragons.
Oh and yeah the lighting should be darker, after all if we need light we got spells and torches, and in terms of realism there should be caves around that are pitch black, maybe there would be no animals or goblins or anything in those caves since they would perhaps require at least a tiny bit of lighting, but there could be old underground tombs for example with braziers that went out long ago that could be haunted by ghosts that don′t care for any light, really I′d be interested in a pitch black dungeon. But of course there should be way less of those than caves with fires burning inside of them or cracks in the ceiling that let in light and such, places where we could find cave bears and goblins or other alike creatures.