What to think about all the extra's they could contain, like videoclips, behind the scenes looks, (tv)interviews and more.
And not just 5.1 also DTS.
The China Concerts; full concerts, seperated from the docu-material, the real live performances (like you can hear on the Peking radio broadcast).
How about Place de la Concorde, both version; the official video release and the tv broadcast!