LTE has been active for short periods, a few hours up to a couple of days, on numerous upgraded towers that don't yet have upgraded backhaul. Presumably this is done for testing purposes. I've seen it all over central Illinois since last fall. LTE for one day, then gone. LTE showing up for a few hours or days does not mean the new backhaul is installed.
I frequently get over 1 mbps late evening and early morning on the 3G tower near my home.