NCL announced that construction has started on 2 new "F3" ships, which will be named later. The first is expected to be delivered in 2010.
These ships will hold 4200 passengers, about 1800 more than the new Norwegian Gem. There will be lots of space for things like bowling alleys. Details of what we can expect onboard these ships is not being revealed yet.
The ships are being built at Aker Yards in St. Nazaire, France.