HTC One users who are on T-Mobile or AT&T are likely to get their Android 4.4 Kitkat Update soon. Both these carriers have been a little slow in sharing their update with eager users. Sprint launched their HTC One Kitkat update in the last week of January, while Verizon also released their wireless version in early February.
Still waiting the update are AT&T and T-Mobile users. However, it is believed that T-Mobile will soon set up their Android 4.4 Kitkat update and you should expect it on your phone anytime now.
HTC President Jason Mackenzie also said on Twitter that T-Mobile and AT&T users should be expecting the update in the coming week.