First to introduce the new seats in Cathay Pacific fleet will be the B777-300ER which will be replacing the A340-600 on Hong Kong-New York JFK route...
After the B777-300ER will be the new second-hand B747-400 which Cathay Pacific are still introducing to their fleet... In Cathay Pacific plan, they are hoping to take around 2years to reconfiguate all long-haul aircraft... By which means they will be having the new seats on all Cathay Pacific long-haul fleet by 2009/2010...
Having said that, as Cathay Pacific will be returing their A340-600 to their leaser (ILFC) as the B777-300ER arrive, so Cathay Pacific will not have the new seats on A340-600... At the same time, Cathay Pacific is planning to retire some A340-300 as more B777-300ER join their fleet, so not all A340-300 will receive the new seats either...