The OS company can't tell you when it will be available at the carriers. That is the carriers job. They will announce when they are ready to announce.
Now, if this was a Surface phone announcement then they could release dates and carrier info. But this isn't their hardware. Only their software. It is up to the OEM's and the Carriers to announce this.
Have patience, it won't kill you if this isn't announced in the next ten minutes.
Sigh.
Yes, I know Microsoft isn't a carrier or a manufacturer.
But the whole point of leading up this event is to end all speculation, anticipation and have people watching the broadcast or reading the liveblog charged up and ready to visit a Microsoft store or carrier store THIS WEEKEND or whenever the specific date of release is.
This would only behoove their carrier partners and also behoove the manufacturers, who likely wouldn't be able to get this as much visibility for their product on their own. They obviously had the embargo lift and device reviews coordinated and ready to go now. They should have had these dates coordinated as well.
If this had happened once, it might be understandable. But the fact that there have been four "events" now related to either the Nokia Lumia 920, Windows Phone 8, or a combination of the two with NO price or release date is a travesty any way you try to spin it.
Part of Apple's superior salesmanship is getting people worked up at their events and then giving them specific action items (Preorder on X date! Buy on Y date!) to take up as soon as the event is over. With Windows Phone 8, you juust have to keep checking blogs and websites to get all of the info you need. Not cool.
Making the consumer do work to buy YOUR product never is.