The bad news is that they won't be able to release the new "Leopard" Mac OS X operating system at the Worldwide Developers Conference in June. Instead the launch of Apple's new OS has been delayed to October.
According to Apple Leopard's features will be ready by June but it's probably still too buggy too release. A beta version of Leopard will be available at the Apple Worldwide Developers Conference.
The good news is that the iPhone has passed the required certification tests and is on schedule to ship in late June. The iPhone is partly too blame for the delay of Leopard, as Apple states it needed to relocate some of its engineers from the Mac OS X team to work on the iPhone.