I'd like to see...
Clothcrafting/Tailoring Skill Tree
Nature Magic Skill Tree
Throwing Weapons (daggers, hatchets, slings, javelins, etc.)
Increased Level Cap for Skills and Character
Capes (also them being able to be enchanted)
Dyes (seeing some armors and weapons in alternate colors would be cool)
Multiple Followers
Followers able to ride horses (and dragons if you've got Dragonborn)
Child Followers (you can already give them daggers that they practice with)
Seasonal Foliage
Free traveling to Cyrodiil and the rest of Tamriel
2-4 Player online mode
Option of real time cart traveling
Full and/or half dragon transformation of the character