i always found in oblivion, morrowind, and fallout that it was annoying how the characters jumped.
while i think it will be improved in skyrim, there is one thing i want.
that is the ability to vault over a chest high fence and perhaps even grab on to ledges (which i don't expect and will not disappoint me if it isn't in).

nothing to the extent of assassins creed or even gta 4. i just think there should at least be some primitive form of platforming in a game of this generation.

even something like fable 2 where you can just jump over fences would be nice. i just hate totally clearing fences because who does that?...
well unless you have a high acrobatics.

like this...
http://www.geekshow.us/wp/wp-content/uploads/2009/01/fable_2_fence_hop.jpg