I think the ship has long sailed for an Astonishing live album.
The reality is, unfortunately, it is one of the least popular DT albums. I doubt they are going to revisit it live just to play a note for note rendition of it. I can't really see the point of that and I doubt it would be particularly successful.
Of course, if they make it into a proper production, get a 'cast' of vocalists (similar to Ayreon) and costumes, sets etc, that would be very cool.
This should be an interesting DVD, perhaps a bit redundant, bt the band was on excellent form when I saw them at Download Festival.