updated 12:10 pm EDT, Tue May 29, 2012
Keynote will likely contain iOS 6, Mountain Lion announcements
Apple has announced that the keynote for WWDC 2012 will take place 10AM Pacific time on the beginning day of the conference, June 11th. No other information has been revealed about the presentation, including even who will speak. It's generally expected, however, that it will be led by CEO Tim Cook, and offer more details about OS X Mountain Lion and iOS 6. The company could potentially debut Macs equipped with Retina displays.
To go with the keynote information, Apple has also posted an official WWDC schedule and a matching free iOS app. The latter restricts access to Apple IDs linked to WWDC tickets, but can be used to plan out a personal timetable, sort out conflicts, and receive news about things like room changes and baggage check-in times. The app also incorporates maps of Moscone West, and a feed of photos taken at the conference.
The details of some sessions are being kept quiet. These are likely connected to iOS 6, which Apple hasn't formally unveiled yet. Mountain Lion's existence has been public for some time, and Apple may even be prepared to set a release date at the keynote.