SQ may not be the source. Could it be MH? Or EK quitting owned or leased aircraft earlier than planned to take delivery of new stored aircraft with the company's new layout and interior fittings? Or QF doing an SQ, replacing their earliest build aircraft with two of those still subject to firm orders in return for Airbus forgiving the balance (or model switch)? Or KE needing to shed capacity with new 748's adding pressure?
I would say extremely unlikely to be QF - if what you were proposing was true, there would need to be two new A380s coming down the line by now for QF, and there is no indication of that happening.
QF could be the final customer, with the amount of A380s going tech recently.
AS350, B733/4/7/8, B744/8, B762/3, B77E/L/W, B789, A319, A320, A321, A332, A346, A380, AT73/5/6, Q300, Q400, CR2/7, E190, S340, B1900C/D, E110 (E for epic)
NZ, EK, QF, SQ, UA, US, CO, FZ, FR, U2, BA, VA, VS, MH, EI, EY, LH, EN, NM, TG, GZ