"Roughly 15 percent larger than Voyager, the Ultra Voyager will be 126 feet by 1,112 feet, and will stand 18 stories high while cruising at approximately 22 knots. At 100 percent occupancy, it will carry 3,600 guests and 1,400 crew. "
The width and height of the ship will be almost identical to the original five. However, a mid-section will be added making it appear longer. This will allow room for more staterooms and expanded public rooms. Otherwise, its just a slightly larger sister.