US is gonna be tightly contested this gen Congratz to Sony for taking back market share and actually making it competitive.
I still see the One having the edge in the US though. With decent software for Kinect MS has the better casual appeal and with titles like Titanfall (which i think will have a big impact on hardware sales for the one) and Halo coming i think they have the core market sorted out as well.
I think Sony will need to announce some sort of accessory that appeals to casual gamers otherwise they are handing over a huge segment of the market to MS. They also need Naughty Dog to be on its game with U4 which will probably be the biggest draw in the US come holiday 2014. If they do this then maybe they can remain competitive with MS in the US.
Worldwide probably wont be as close with PS4 taking a comfortable lead...but you never know