i admit, i don't see why they don't sell it as Digital download on them shop... physical version is nice and all, but ask to have a blueray not everyone have one. i have the first one and can't read it because of this.
adding this as digital content you can buy and download from them shop will hit a huge succes i'm sure of it. they really need to think about it.

and don't talk about trouble of server for download it, they exist already since we can dl the mp3 version via the disk information when you read it.