The only thing we know for certain that we can expect from Apple's Worldwide Developers Conference keynote next week is a preview of the next versions of iOS and OS X--and that's only because Apple exec Phil Schiller said so in a press release. But the rumor mill (coupled with our own boundless optimism) suggests that Apple may use WWDC to bring a refresh or two to the Mac line as well.Related StoriesApple's Mac OS X 10.8.4 Mountain Lion update brings stability, compatibility, security improvementsFor Apple the price is white
