Apple has announced that WWDC will be held from the 2 - 6 June 2014 at Moscone West convention center in San Francisco. Every year Apple hosts WWDC for it's developers to assist with developer programs, including the iOS Developer Program, iOS Developer Enterprise Program, or Mac Developer Program.
During WWDC Apple announces updates to iOS and OS X software with some minor product launches. It however has made some major product launches including some iPhone models.
During WWDC this year Apple is expected to announce iOS 8, an Apple TV and the iWatch.