The iPhone maker's annual developers conference will kick off on June 7, where the company is expected to unveil the new iPhone.

The event is scheduled to run from June 7 to June 11 in San Francisco. Previously the event has seen CEO Steve Jobs deliver keynotes speeches, though Apple has yet to confirm who will take to this year's stage.

Last year saw marketing head Phil Schiller take Jobs' keynote role for medical reasons.

Reuters has reported that analysts expect Apple to show off the new iPhone at this year's event followed by a launch this summer. It points out that the third-generation iPhone was unveiled at last year's conference and went on sale less than two weeks later.

Last week US service provider AT&T blocked off the month of June for employee holidays, the same way it did with the past two iPhone launches. According to sources, the only time AT &T has mandatory work periods is for new iPhone releases.

Details of the fourth generation iPhone recent hit the web after an Apple employee left a prototype model in an American bar.