As before, AT&T isn't really upgrading anyone to a 5G service. This is still 4G LTE, just with a mix of technologies (4x4 MIMO antennas, 256 QAM and carrier aggregation) that potentially supply faster-than-usual speeds. It's rehashing the strategy it used when it labeled HSPA+ as 4G -- this is more about marketing the network than providing useful information. We wouldn't rule out other carriers jumping on the pseudo-5G bandwagon as they ramp up their real 5G networks, but that won't make it any less confusing.