It is conceivable that we could take another airline's 2011+ orders if they were looking to defer or cancel deliveries. Seems like it would be unlikely though.
As for the -8/380 debate, I think the critical issues are trip cost per square meter of floor space and the range capability to fly within the CX route structure carrying full load pax and cargo year-round.
Any more detail on the performance factors wrt the -8? I am curious about how bad the "miss" is. If the bird cannot make ANC with 135T of freight, I know it will be a disappointment.