Some analyst predicts Xbox will overtake Ps4 in 2015
http://www.gamesindustry.biz/articles/2014-05-13-xbox-one-to-overtake-ps4-in-us-by-2015-says-analyst
Personally, I haven't been too interested in xbox this new generation since kinect bundling and their drm stance before they changed that. But I can see the possibility of X1 narrowing the gap in sales with Sony. At this time there's still a significant portion of gamers still gaming primarily on their xbox 360 or ps3 that have yet jumped into new generation. As time passes more titles will be exclusive to next gen systems and gamers must force to migrate, and from there they'll make choices. With a kinectless model, and cheaper price point, it may be enticing to some prospects. IMO, I still think ps4 is a better value, and could ride a larger wave of momentum depending on the exclusives they offer at e3.