Rumour sounds very dodgy in my view.
I suspect any aircraft purchase contract would be governed by US/ European law rather than Australian law, so a Melbourne law firm wouldn't help much.
As for the A320s - if there are too many for JQ, then I suspect we may see them with a red tail. The last big 737 replacement commencing 2001 with the planes taken from AA after Ansett fell over.
On 787-8s order was trimmed from 15 to 14 in Jan-13, then 3 deferred in Feb-14 (wasn't announced for how long). So JQ is only expecting 11.
The A380s wouldn't surprise me - although at some point QF does need to replace the continuing (and refurbed) 9 747s (inc 6 ERs) and then ultimately the A380s themselves.