I really wouldn't be surprised if this gets pushed back to spring/summer 2016. Releasing it this summer as they had originally planned would have been perfect, given that it wouldn't have had a lot of other titles to compete with for sales; but releasing it right now, especially with all these AAA heavy hitters coming out at the same time, would guarantee that the game would get slaughtered and lost in the shuffle, dooming it to the fate of every previous entry in the series.
Although it might suck for us, releasing it in a slower part of the year like in spring/summer might be in the best interest of the future of this series.