ALL that said...
Combat from hourses is a must. Dismouting to a more vulnerable position to battle a foe is lame.
I think a "hardcoe" mode that disables fast travel, removes quest indicators, and creates a more purist experience would be welcome.
Fable had a way of making you feel like a revered mighty hero or a reviled horrible monster. This sense of reputation and people in awe is sorely lacking from Skyrim. If you are the one and only Dragonborn, people shoud react to you in some meaningful way. Good or bad.
Also like how Fable makes is possible to purchase shops and real estate to a point you become a mogul. At the very least I should be able to open a shop in Skyrim that can sell items I have crafted.
And as someone suggested: why can't I decided to take on the Empire, Ulfric, and claim the throne as my own? I AM THE DRAGONBORN. For all the freedom given, it is sometimes amazing the freedom that is lacking.
I think these are the things I would like to see them focus on in the DLC...why wait until next game?