In a tweet published earlier today, HTC U.S.A revealed that the much-anticipated Android 4.4 KitKat update for all Sprint, Verizon and T-Mobile branded handsets of its flagship smartphone, the One, has just entered carrier labs for final testing, and we should be seeing certification as early as next week (certification is the third of four necessary stages involved in pushing out an OTA). So, hopefully, presuming no problems are detected, we only have a couple more days until the over-the-air upgrade starts arriving on our devices.