My prediction? Despite the rumors, Apple will leave any future iPhone hardware announcement for this fall. (This is one time I wouldn't mind being wrong, though.)

Also on tap: More information about the next-generation Mac OS -- OS X Mountain Lion. Much is already known about the , but there are a few tricks likely to be detailed at WWDC, such as support for a pixel-dense screen Apple would likely market as a Retina Display for laptops.

Speculation about new slimmed-down MacBook Pro and updated MacBook Air laptops has been rampant for months, and analysts . Obviously that didn't happen, meaning they're a virtual lock to be unveiled at WWDC. Bolstering that view: Apple is now that tout "Retina graphics." What remains to be seen is which models will carry the new display, which offers super-high resolutions like those seen on the iPhone and the latest iPad.

In the past, Apple has offered different options for notebook screens, from glossy or matte finishes to slightly higher resolutions. Will a Retina Display grace only the highest end of the notebook line? Or will Apple use the Retina Display across the entire line-up as a major differentiator from the competition? Not many companies have the clout -- or the will -- to push such an expensive initiative, but bold moves would help Apple stay ahead of copy-cat competition. My expectation is that a Retina Display will be available as a standard feature on all but the base models, and they'll cost more than existing laptops.