SQ did order B773ER...
I think most asian carriers have the possibility of ordering B748i... Those which havent order B773ER nor A380... And have B744 in their fleet... Since B748i seems like the best replacement for B744...
And it looks like we would see the future long-haul fleet with B787/A350XWB doing less demand routes and B748i doing the high demand routes... A380 is less efficient compare to those new generation jets... But there is no competitor in the field with A380 capacity... So we will see airlines flying A380 on very high demand routes...
About B777... I dont think many more airlines would consider... Since the B787 will soon be in operation... And airlines like SQ is already find replacement for their B777 fleet...
To SQ... Any jet that is over or near 15years old are old...
So by 2012... They will have B787 on regional routes and Australia... And A350XWB on their middle/long-haul flights...