Singapore Airlines kann auf 777-10 upgraden
the first (latest) article is in german, but definately says SIA can hadle a 777-10. and it also say that it will be sized beyond
(!) 80m length. and it also says, that SIA and Boeing made a contract according to which SIA can switch from the 777-9 to a "non-existing aircraft" when desired. sounds like a 777-9 order with the option to switch to a -10.
technically the -10 only seems to be a stretch of the -9, maybe this facts help during finding the decision process. remember, the 767-400 was only made for Delta and United. - or it wasn't a hotseller....dunno.
Singapore is flying the 77W with 9-abreast, so hopefully they also use this config. for the -9 (and -10 respectively).....