I would do December 2014..Even then , expect it to be busy in those sections of the parks.Crowds are going to be very very busy for a long long time after the expansion opens. It has been 3, almost 4 years and the WWoHP at IOA is still the busiest, most trekked to part of the parks.We are going again in Decmber 2014 and we are planning on it being busy despite being a slower time in general