Let the hive mind of Engadget get that for you.
"I'm pretty much a complete noob when it comes to camera stuff. My wife loves to take pictures, though. So much so that she literally wore out her first point and shoot camera, and the Kodak Z712 I bought for her less than two years ago is starting to act up as well. To compound the matter, we are expecting our first born sometime next year. I fear the Kodak just isn't going to cut it any longer. What would be the best starter DSLR to get? She hates missing photo opportunities due to camera 'lag' so speed would definitely be at the top of the list. Photo quality and features would be next. Price should be no more than $800. I'm not interested in video capabilities."
So even if you want the physical disk, it sounds like you get "for free" the ability to watch the movie on whatever device you want.
If this is an accurate interpretation, then it sounds like Disney is the one media company who actually "gets" what all us consumers want -- we don't want to buy the same thing 37 times, and we want to be able to use it anywhere. Sounds good to me.