Forget "5G" marketing hype. LTE is going to a gigabit in 2016 at Telstra in Australia and SK in Korea. AT&T and just about every other large carrier plans 600 megabits to a gigabit in the next few years. (Update September - AT&T confirms 12-18 months.Qualcomm is shipping the gigabit X16 LTE chip. Gigabit LTE uses more bandwidth, 60-100 MHz in total (Carrier aggregation); more antennas, 4x4 and 8x8 MIMO; and more bits per signal, 256 QAM.
Aggregation, MIMO, and 256 QAM will dominate the next five years. 5G highband will be exciting, great pr, and only minimally deployed until at least 2021 and probably a few years later. NTT DOCOMO's CTO Onoe expects nearly all "5G" advances to be under 6 GHz until 2022-2023.
Update Sept: Softbank Japan has turned on world's first 5G. It's Massive MIMO, not mmWave.