I’ve been keeping an eye on the 60ghz millimeter wave techology. Why? Because being able to go 200-300 meters at 10gbps and possibly up to 1km under the right conditions allows faster deployment and lower cost of high speed connections that in the past would require fiber. 40gbps systems are being worked on next.
TechCrunch covers 60ghz being added as a Telecom Infrastructure project. https://techcrunch.com/2017/09/12/facebook-backed-telecom-infra-project-adds-a-new-focus-on-millimeter-wave-tech-for-5g/
Facebook announced their 60ghz efforts last year. https://code.facebook.com/posts/1072680049445290/introducing-facebook-s-new-terrestrial-connectivity-systems-terragraph-and-project-aries/