For those of you who haven’t had the chance to take it for a spin, Sprint’s 4G WiMAX network is quite the treat; the only problem is that it’s currently offered in 27 select markets. Well today Sprint announced some more key markets that it plans to blanket with 4G goodness by the end of 2010: Cincinnati, Cleveland, Los Angeles, Miami, Pittsburgh, Salt Lake City and St. Louis. Earlier on in the year Sprint also announced it will be operating the new network in Boston, Denver, Kansas City, Houston, Minneapolis, New York, San Francisco and Washington, D.C. Translation: 120m Americans will soon have access to some pretty mind-numbing speeds. Gee, now why would Sprint tell us this today?