2. Reliable Verticality
There was a very strange feeling in the crowd (or the pit of your stomach if you watched the footage post-E3) when suddenly a montage showed your Lone Wanderer taking to the skies in a makeshift jetpack, looking essentially as bulky and unwieldy as Obadiah Stane's Iron Monger suit from the first Iron Man. As mentioned earlier it's not very likely Bethesda will create a climbing system from scratch that would let you traverse mountainsides and ravines - but they can certainly refine the problems Skyrim had with verticality overall. There's a good reason the phrase "Skyrimming your way up something" connotes that of awkward character movement ambling feebly from foothold to foothold as you attempt to get to the top of whatever surface is ahead of you, and with the introduction of jetpacks into F4 it looks as though you'll be seeing a lot of that world from above - something that shows a confidence in the world terrain that can easily carry over.