CASA have just released an urgent AD for improved inspections of lap joints in the area of the wing/fuselage join (eg: right where this occurred).
Perhaps somebody can post a copy of the words that CASA used to justify the AD in order to see if there is any linkage with this thread discussion.
It seems that if this is not unique to Qantas than the FAA as the regulator of the certicate holder is bound to verify and reissue a broader AD .
I'm not sure yet if this is a clue in this thread.