Verizon and Nokia refuse to wait for 2020 for 5G. Massive MIMO promises major speed jumps in the same spectrum. Testing in 2016 for Massive MIMO, beamforming and interference cancellation. Hopes for huge speed boost starting in 2017. Think 64 antennas and 5-10x throughput. Good engineers tell me it's possible but didn't expect it so soon. At the new 5GW News

Verizon Ready to Try Massive MIMO and Beamforming
Nokia's Moiin Believes M-MIMO/IC from pCell is Ready
"Go Massive," Says the Texas MIMO Man - and Verizon
What the heck is Massive MIMO? What's Beamforming