Over the past three years, Apple has only made software and PC-related announcements at WWDC. Even though Apple did unveil their iPhone 3GS and the iPhone 4 during past WWDC event, they now have dedicated events for their flagship smartphones. During WWDC, the public generally gets a first glimpse at the software platform which will eventually make its way to the public alongside the new flagship.
Apple is known to break tradition, so we cant wait to see if it will break it again and unveil a 4.7 inch iPhone 6 at this year's WWDC?
source - WWDC