Here you go with the very first rumor of WWDC 2011, CultOfMac pointed a suspicious booking at the official website of the Moscone Center in San Francisco. Moscone Center is booked for a 4 day corporate meeting during 5th June to 9th June. Taking into account that the similar event held last year was presented to the WWDC 2010 and iPhone 4.
After digging a little more we found that Moscone center is booked in the same manner for the next five years.
- WWDC 2011: June 5 to June 10
- WWDC 2012 : June 10 to June 15
- WWDC 2013 : June 9 to June 14
- WWDC 2014 : June 1 to June 6
- WWDC 2015 : 7 June -12 June