http://www.androidpolice.com/2017/02/10/what-is-5g-the-laymans-guide/
And Verizon is doing a 5G test pilot in these cities.
Ann Arbor, Atlanta, Bernardsville, Brockton, Dallas, Denver, Houston, Miami, Sacramento, Seattle, and Washington, DC.
What that actually means and how Verizon defines it are unknown. But 5G is interesting and challenging and exciting. And coming.