According to Apple Insider Report Apple may have already booked the Moscone Center for their annual Worldwide Developer’s Conference. In previous years, the conference has been used to introduce new iPhone models. Last year WWDC 2009 was scheduled at the Moscone Center in San Francisco, CA, and ran June 8-12 of 2009. AppleInsider has noticed that The Moscone Center Calendar lists a “Corporate Event” from June 28, 2010 through July 2, 2010 in the Moscone West hall. Previous Apple events have been reserved with the same title.
According to Wikipedia the first WWDC was held in Monterey, California in 1983. Until 2002, WWDC was held in mid-May. From 2003 to 2005 it was held in June to better distribute Apple’s show commitments. In 2006, WWDC was moved to August due to scheduling conflicts at the Moscone Center. The original iPhone was released on June 29, 2007 and required an exclusive contract with carrier AT&T. It has since been rumored that this contract with AT&T could expire in 2010. If WWDC 2010 does take place on June 28, 2010, Apple might use the event to announce an additional carrier for the US.