On the day of one of the most-awaited mobile operating system updates, iPhone 3.0, even basic details remain mystery. We do know it is coming sometime today, June 17th. And Apple's Web site kindly informs us that iPhone users get it free, but iPod Touch owners will have to pay for it (our guess is about $10, based on the last iPhone OS update).

How do the upgrade's new cut-and-paste, landscape keyboard, and direct-video downloads cut it? And how much better are the new searching and calendaring capabilities? Stay tuned. —Mike Gikas

Update: Engadget.com speculates that we may see the iPhone 3.0 update around 1 p.m. E.S.T.