I think we need to clarify -the eight Indian P-8's are in production with the first one having flown . The US Navy machines are under evaluation -this isnt a concept aircraft -its a maritime patrol aircraft in production.
Forget any ideas of getting worn out P-3's -the push will be for RAF P-8 aircraft -BAe Systems already has input in the computing suite and I am sure its only a matter of time once a European launch customer has signed.