Disney Parks Chairman Bob Chapek surprised the crowd at D23 Expo 2017 by announcing that Disney Cruise Line will add one more ship in its expansion to take family cruise vacations to a whole new level. Joining the other two new ships that were announced just last year, all three ships will be powered by one of the cleanest-burning fuels available, liquefied natural gas. When all three ships are completed by 2023, Disney Cruise Line will have nearly doubled the size of the fleet.