According to one report, T-Mobile will start taking online orders for the phone at the stroke of midnight Tuesday evening/Wednesday morning. A glitch in the system is said to be delaying T-Mobile from taking orders immediately after the unveiling of the device. That is supposed to take place tomorrow in New York City, and simultaneously in London, at 11am EDT (3PM GMT).
And if it does turn out that Verizon's exclusivity for the all new HTC One (M8) is indeed limited to in-store sales, we would imagine that besides T-Mobile, we would see AT&T and Sprint start accepting online and phone orders tomorrow as well for the eagerly awaited handset.
Tomorrow is the big day for the all new HTC One (M8)
source: DroidLife, TmoNews