Sprint: Don't expect US to be leading the way into 5G by the year 2020. Verizon: Much sooner

Most of these companies have pegged the year 2020 as the first commercial roll out of 5G, almost certainly to occur in Asia. While the US has not necessarily been the leading market with such technological advances, it has been a very fast adopter of these technologies – no small feat given the size of the American continent.
Taking an opposite stance to that “American’t” attitude, Verizon is expecting to begin field testing 5G technologies in 2016, and possible limited commercial deployment only one year later! Any such rollout would have to be viewed as a prototype-only system as the standard is defined and refined.
Despite lacking a defined specification, most parties agree that 5G will deliver data speeds well in excess of 10x current LTE and LTE-A networks, with much lower latency. FCC Chairman Tom Wheeler is heading up the task of publishing rules for 5G usage on spectrum in the ultra-high bands of 24GHz and higher.
source: Light Reading