KitKat can be pulled out of your Sprint branded HTC One using a 'customer initiated request'
Now, there is a chance that Sprint customers sporting HTC's flagship Android model can manually pull the update out of their phone. Technically, this is called a customer initiated request. You go to Settings > Software Update > Check New. If the results are negative, be a little more patient. Software update 4.06.651.4 will start its network rollout on February 14th.
Last week, we passed along a leaked HTC update roadmap and it showed that the carrier branded HTC One would receive the Android 4.4.2 + Sense 5.5 update anytime between late January to mid February. Looking at what is happening from that standpoint, it looks like HTC will be delivering the goods right on time.
source: Sprint via AndroidCentral