Couldn't tell you why Kill Bill Vol. 1 and not Vol. 2. From what I can see it's not an exhaustive list, so it might just be out of date. There are some older catalog titles Warner announced for HD-DVD that aren't on that BluRay list even though they've said they'll be releasing the same titles for both (North By Northwest is one I can think of off the top of my head).
I'd expect the case artwork to remain mostly the same between DVD and BluRay/HD-DVD. No reason to change it really.
Ignore the "Beyond High Definition" verbiage. Marketing junk I'm guessing.