If it's a 'new order' with manufacturers then it's either additional 787 or the A350 (with the possibility of additional A380s); or, it's as GB says and the much vaunted 737/A320 replacement machine to arrive post 2012 or a combination of both.
If QF decides to get 777s they'll come from ILFC and they'll turn up in a hurry (before the end of next year) because QF is short of capacity. They're not going to order the 777 for delivery in two to three years time because the 787-10 will be so close then that it'd be silly.
Time will tell.