Those improvements are seen by some as a necessity if the models are to remain competitive with the new ultrabooks flooding the PC market.

Currently, Apple makes 13-, 15- and 17-inch MacBook Pros. Some Apple tea leave readers believe that may change. With the Air covering the 11- and 13-inch form and the 17-inch version being largely a niche product, they believe Apple can afford to make the MacBook Pro a 15-inch only machine.

Whispers of an will no doubt be circulating at the WWDC, but odds are there won't be much very solid to report in that vein. If such a device exists, it probably won't happen until later in or beyond. However, Apple may have some content announcements about its Apple TV set-top product. Some believe that set-top hardware is being used by Apple to test ideas that will eventually end up in a TV set product.

, Apple gave developers a taste of what the next version of its desktop operating system, OS X Mountain Lion, will look like. Many of the changes reflect design changes to make OS X operate like its mobile cousin, iOS. That's expected to continue at the WWDC.