Until now, however, all rumors pointed towards AT&T taking the stage front and center, alongside with Microsoft, to lend a helping hand with marketing, as the "premier carrier" for Windows Phone 7. Now it looks like T-Mobile will be showcasing its WP7 devices and services for an hour - from 15:30-16:30 ET, as well.
Well, nothing is preventing AT&T from appearing in the keynote, which starts at 15:05 ET, is it? Or, at least in the opening fireworks. As for T-Mobile, there is a great possibility it will flash the audience with the HTC HD7.