Spring has sprung and a ton of smartphones have made their way through FCC testing, including the Samsung Nexus S 4G. Listed as model SPH-D720, the Nexus S 4G has been cleared for WiMax channels, pointing towards a Sprint release. Sprint has already hinted of a Spring release, but other that that, mums the word. Originally, we reported that Best Buy was going to launch it April 6th. But as of this writing, that hadn't happened, probably waiting to clear the FCC before launching a full court press. There's plenty of time left in Spring, however, so no need to panic yet.