I always keep an eye on VGChartz and I find it really interesting that the PS4 is outselling the Xbox One in North America every week!
http://www.vgchartz.com/
If you take a look at the Xbox 360 sales its clear to see North America was it's best market - I saw it as a machine designed by an American corporation for American consumers and others can use it if they wish. I got the same feeling when they announced the Xbox One with all these live features such as fantasy teams in Basketball and the TV integration e.t.c with North America getting first dibs with other markets to come if the demand was there.
However it seems as though the Americans aren't sticking by their 'homegrown' console with this one - I think a lot of it is due to pricing - why isn't there an Xbox One available without Kinect? This would make it more competitive with Sony. Is the novelty of movement/speaking to your console one that has wore thin already?
Has the fact Sony now charge for online subscription give people more faith they can provide a better infrastructure for their online service?
Sony have sold 50% more PS4's than Microsoft have sold Xbox One's (and was released two weeks later in Europe! One week later in N. America!) and if I was Microsoft I'd certainly be assessing the current marketing/pricing strategy they have in place.