Think about it
*Orsinium is way too small to be its own game.
*Half of High Rock is in the game, untextured but still in the game.
*The conflict between Orcs and Redguards/Bretons would make a great story and my Orc skirmisher would love to split some Breton skulls.
*Todd Howard always said he would love to redo High Rock and this would be a great chance.
* The Elder Scrolls 5: Orsinium, that just sounds badass

The place is spelled Orsinium though.
but in all honesty what i would like from a DLC is, apart from a nice new location to explore, a decent amount of new item's, well written main quest/side quest's and hopefully some decent new monster's etc which i hope are not simple re-skin's but most likely will be. Ah well only time will tell.