According to sources unfamiliar with matter, there will be no new iPhone at WWDC 2011 contrary to currently circulating rumors of iPhone 4S. Apple is likely to seed iOS 5 to registered iOS Developers following WWDC Keynote.
iOS 5 is reportedly bringing the much-needed new UI changes to iPhone 4. One source even said that iOS 5 requires the minimum of Apple A4; this is yet to be confirmed.
WWDC will kick off with Keynote from Steve Jobs and team of Apple Executives on Monday June 6th, 2011 at 10:00 a.m. Pacific Time. You can find links to the live coverage here.