This week, AT&T announced that it's rolling out 5G Evolution - a 4G LTE service that has nothing to do with 5G - to parts of Indianapolis. The service was announced back in April, promising "carrier aggregation, 4x4 MIMO, 256 QAM and more". In other words, it's something that other carriers have been doing for some time, under it's real name, which is 4G LTE-A.
But disregarding the marketing jargon, users in Indianapolis will of course see increased speeds, as long as they have a phone that supports it, like the Samsung Galaxy S8 or S8+. Those were the only two phones that the carrier mentioned in its announcement, but other phones with modern chipsets should work as well.
AT&T says that it plans to bring 5G Evolution to 20 metro areas before the end of the year, which include the previously announced Atlanta, Boston, Chicago, Los Angeles, Nashville, and San Francisco. The firm says that it will have more to share regarding future areas when it gets closer to launch.
As far as actual 5G goes, that's still a ways off. The draft specs were only published in February, but once it's available, it will be focused on allowing for more bandwidth in a congested area.