I wouldn't read too much into this - Singapore is known to keep a young fleet, dumping airframes when they're due for heavy maintenance and getting new ones.
Singapore previously had stated they intended to take delivery of the A380's currently on order. I wouldn't be the least bit surprised if Singapore simply replaced some 10 year old A380's with new ones, keeping the same number of operational A380s.
However I expect the leasing company may be getting seriously nervous - at the moment there doesn't appear to much interest in taking second hand A380s.