The B787 was ordered by the QF group for many reasons - but one important one was the delivery timetable promised by Boeing. It was going to be ready several years before the A350.
Now that the B787 is going to be further delayed by 6 to 12 months (there was a Seattle newspaper article recently which detailed some of the technical issues), the difference in delivery times will be so much shorter.
So the B787 still makes sense for mainline, while the A350 would integrate into the JQ fleet so much better. And BB did tell some techies recently that he was in talks with Airbus for a substantial order. He just didn't say what types...