This is great news. I was always a bit hesitant to buy HBO content on iTunes due to this.
Now if only I could upgrade my SD shows to HD for a small fee… Come on iCloud, you can do it!
It also seems to me that Apple is putting more emphasis on HD content in both the movie and television stores. Perhaps this will be part of a bigger push in the fall… It really is kind of silly that SD and HD versions still exist separately. There should be one download.