Just to be clear, I had a 4G icon on my HTC One, indicating that I was indeed pulling from LTE. I didn't have a chance to screenshot a Speedtest and I went out of range of LTE pretty quickly.
What struck me as awesome, especially coming from a few years of using Sprint WiMax phones, was that when it moved from 3G to 4G and back to 3G, I didn't have any connectivity interruptions. I'm guessing I kept the same IP. This is related to eHRPD, right?