Good question, I want to know this too. If reports are good and it can competently fly at least 3mi in open areas, I'll be buying myself one for Christmas.
I was very disappointed in my P4 range using the stock GL300C controller, often crapping out at 4000' in open areas that I normally go 2+ miles with my P3P. My P4 didn't perform nearly as well as my P3P (with GL300A) for range. However using an Inspire controller (GL658A) with my P4 fixed that problem. Both craft can go 3mi with windsurfer in most open areas, but 2 or 2.5mi is usually my norm for long distance flights, providing some loiter time.