I have only ever owned and used an xbox 360 console, and prior to the latest information about the new generation of consoles, I would not have anticipated changing - but I am not a fan of the direction that Microsoft are going in with the XBox One, nor am I enamoured about the lack of retro-compatibility, the restrictions on the used games market, or a kind of "one box does everything" approach- and they really are extorting non- US customers with their pricing policy.
I will be switching to the PS4 this time around - reportedly a better gaming machine, cheaper, and able to play 2nd hand games.Nor will it be region restricted. About the only thing that the XBOX has that appears to be superior is the latest evolution of Kinect.....