Similar to NA, you can buy Saipan in a bundle or just buy the ship, which I hope WG continues to do with future premium ships. I got a laugh out of this note on the ASIA news page, though:
Note: Aircraft carriers are basically floating airbases; they are played in a completely different style compared to other ship types. It is highly recommended that you experience playing in other aircraft carrier prior to purchasing this ship.
Well, at least they tried, right?