Microsoft Investor Relations (NASDAQ: MSFT) announced they will be holding a conference call / webcast at 8 AM PDT today to explain the new Windows 7 upgrade program (and discount program for early purchasers) and related accounting information for investors.
The Webcast and Powerpoint presentation will be available here.
Some insight was been provided earlier in this video from the Windows Team Blog:
Announcing the Windows 7 Upgrade Option Program & Windows 7 Pricing
Update 1 - 6 PM ET: ArsTechnica appears to have the rundown on upgrade and full pricing in an updated piece here.
Update 2 - Channel 10 (owned by Microsoft) has confirmed the pricing being reported.
Update 3 - Friday June 26, 8 AM ET - The two Microsoft Windows 7 upgrade program websites are now live here and here, although some individual manufacturers are still putting up their own pages.
Microsoft is also now offering the Windows 7 pre-order pricing at the Microsoft Store.