I don't know If this has been posted before, but I figure I should get my ideas out there and get talk about it.
In my opinion, I would rather have content than a pretty game. But, I believe that Bethesda could do both. (:
And these are some thoughts that have came up with me and my friends sense the game has come out.

• Capes
  Everyone wants capes. Capes are just badass.
  
• More customization.
  How in Marrowind we could have our own armor on, then we could wear just normal looking clothes to, to add that extra look for your character.
  
• More unique items
  Not just, "Oh, hey. This is an ebony sword with a name and a special effect." A whole new different model for the weapon. And then make those weapons useful and not crappy. Make them rare and actually worth using.
  
• More "odd" enemies
  In the past games there have been non-normal enemies to fight. There we're enemies that just look fiction. Yes, there are those enemies in Skyrim, but I've felt that just not as much. Like the majority of the enemies you fight most of the game, feel too real-worldish. Human, wolves, etc. I think if Bethesda brought back or just made more common the those not-normal enemies.
  
• Another niche
  I feel as that Bethesda relied too heavily on Dragons. Dragons were fun for just so long until they got annoying. (Especially for straight-forward melee character.) If there was another "something big" to the game.
  
• Bring back old stuff
  unarmed, unarmored, spears (i'm aware that there is a chance for these in dawngaurd.), all those extra aspects to the game there and we could use after all the main stuff got boring.
  
• Smithing Improvements
  This would go along with the "more customization" We could personalize our own armor to our liking. And that there would be different models for each type of armor, (ex. 4 models for iron, steel, etc.) then we could have model 1 of iron gloves with model 3 helm and then model 4, etc. I feel stuff like that would just be a cool addition. And then have a Iron sword with gold trim and an ice wolf pelt grip. But, of course you'd have to collect the needed items to do so.
  
• Epic encounters
  This would tie along with the Civil Wars quest line, have little battles of Stormcloaks and Imperials like on roads and out in the plains. That would be awesome if you were just strolling along and then BAM! Little battle going on.
  
• Longer questlines for the guilds.
  I don't know if it was just me, but they seemed short.
  
• A Misc Perk tree.
  Bring back some fun perks like some of the things they did in the Fallouts. And to unlock these perks, it would be based on you main level.

These are just some thoughts of mine that I thought you guys might enjoy seeing and talking about.
Looking forward to feedback.