Microsoft now says cost is an issue for bringing it to market. "I wouldnít expect youíll see that," explains Albert Penello, head of product planning for Xbox One, in an interview with AusGamers. "Itís really super-neat if youíre in the lab and youíve got Microsoft money and you could totally set up this awesome lab, but... we looked at it, but for an average customer itís, like, thousands of dollars [for the set up]."
http://www.theverge.com/2013/9/2/468...to-be-released

Their leaked document detailed this tech for a 2014 release but I guess they need to do a bit more research on it.