Harmy said:

They could have easily put this on the BD - ever hear of the Maximum Movie Mode? And even if they couldn't do that, I doubt that the iTunes download is bigger than 5GB, so it could easily be included on a bonus disc along with a lot of other bonus material in exactly the same quality as the iTunes one.

I don't think anyone is questioning the technical possibilities of this content ;-)

Maximum Movie Mode is awesome - wish they did something like that with Star Wars - like a Jambe Davdar documentary on steroids!!