With all the references to a second thalmor war in skyrim,there could be a dlc in valenwood,the player would help overthrow the thalmor and estabilish valenwood as a imperial province again in a guerrilla war,this would be the prologue for the grand war in TES VI.
The reasons i think this would be good are:
*Such a dlc would benefit greatly of the awesome graphics of skyrim,the forests of valenwood would be stunning
*The "alien" feel,last experienced in morrowind would come back with the different trees,beasts,etc
*New enemies,something skyrim could use a lot
*More light armor sets
What do you guys think?