With the Fall 2013 update to my Premiere, I note that the Wishlist UI is now in HD. Huzzah!
I had to chuckle, when I went to the "Exclusive Roamio Offer" in the top discovery bar though, it displayed in an SD window. Talk about boneheaded, TiVo... LOL!
What other screens are still ridiculously formatted in SD?
Most everything under Settings (ie: Parental Controls, Messages, Account & System Info)
Showcases & Apps
Manage Recordings & Downloads - Find by Time
Manage Recordings & Downloads - Find by Channel
FWIW, I wouldn't mind so much if the screen didn't flash black before switching.
I do also note the HDUI feels a lot faster now than ever before.