Robert Archer of CE Pro magazine (one of the most informative AV install publications) has been commenting on the iTunes move towards high res playback solutions and he appears to be unconvinced that they are real.
Neil Young had come out a couple of weeks ago saying that he'd been working on a true hi res download format with Mr Jobs before his passing and that Apple were now in hiatus about further development. This "Mastered for iTunes" approach apparently hopes to replicate a CD quality digital file for download ... however there is deep scepticism within the professional recording industry that this is a real approach and not simply good old acronym marketing:

Ce Pro 28/2/12 "Mastered for iTunes, is it legit?".