The HTC One (M8) for Windows is going to be available to T-Mobile USA customers starting on November 19 - tomorrow.
The information was confirmed by the carrier itself over on Twitter when answering a customer question.
Initially T-Mobile was supposed to unleash the metal-clad smartphone to its customers on November 9 but didn't.
The HTC One (M8) for Windows uses the same excellent hardware but runs the latest Windows Phone 8.1 instead of Android KitKat.
@chrisevans937 We found it!!! The HTC One M8 for Windows is coming 11/19 to T-Mobile. *JM— T-Mobile USA (@TMobileHelp) November 15, 2014