Ericsson has been doing a lot of upgrades to the legacy network, adding carriers and more backhaul capacity, to help the legacy network keep up with demand until the Network Vision upgrade. The Cleveland market, according to this thread, is a third round market, with work starting in December. This is a guess, based on documents from the start of the Network Vision project. Sprint recently disclosed they are running about one quarter behind in NV upgrades, so you can make your own assumptions. Really, the best way to know, is to become a sponsor of the site and get the updates in the sponsor section, or monitor sensorly for LTE popping up in your area.