According to folks over at Android Community we can Unlock HTC EVO 4G LTE Bootloader unlike that of AT&T’s HTC One X. Sprint isn’t imposing the same restrictions as AT&T has. It is supported by HTCDevelopers Unlock Tool. If you wanted to run custom AOSP ROMs like CyanogenMod and AOKP then you have to wait little bit.
Head over to Android Central For More Information