3x Mobile OS, June 2012, San Francisco, Moscone Center

Mobile OS Madness Ahead In June - Mobility - Smartphones - Informationweek

• Apple's Worldwide Developer Conference (WWDC) is set for June 11-15
  at the Moscone Center in San Francisco.
  Expected iOS 6.
  
• Microsoft's event, the Windows Phone Developer Summit,
  is scheduled for June 20 and 21.
  A location has yet to be announced, though it will likely be at Moscone.
  Expected Windows Phone 8
  
• Last, Google I/O June 27-29.
  is taking place at Moscone
  Expected Android 5.0