My worry is that, if we get more realistic, steep mountainsides, will we still be able to explore every inch of the map? In Oblivion, the rounded mountains may have looked unrealistic, but they were at least fully scalable. If Skyrim forces us to be funneled through designated mountain passes, it will take away significantly from the sense of really being able to go anywhere you want in the world.
If there is a cliff side or steep slope, there needs to be some means of climbing it. Maybe levitation. Maybe pickaxes and a climbing skill. There has to be something. The idea of "un-traversable terrain" shouldn't exist in TES.
Does anyone feel the same, or are you alright with a more limited open world?
(note that I'm talking about inside the map, not map boundaries. there are already enough threads on that)