Highlights: Apple WWDC 2012

Phil Schiller, Apple's senior vice president of worldwide marketing, talks about new features to the company's laptops during the Apple Developers Conference in San Francisco, Monday, June 11, 2012.

Phil Schiller, Apple's senior vice president of worldwide marketing, talks about new features to the company's laptops during the Apple Developers Conference in San Francisco, Monday, June 11, 2012. Apple says it's introducing a laptop with a super-high resolution 'Retina' display, setting a new standard for screen sharpness. (AP Photo/Marcio Jose Sanchez)

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1/6 Phil Schiller, Apple's senior vice president of worldwide marketing, talks about new features to the company's laptops during the Apple Developers Conference in San Francisco, Monday, June 11, 2012. Apple says it's introducing a laptop with a super-high resolution 'Retina' display, setting a new standard for screen sharpness. (AP Photo/Marcio Jose Sanchez)

Craig Federighi, Apple Senior Vice President, Software Engineering, with a man in a racing suit, demonstrates Racer OS X during the Apple Worldwide Developers Conference 2012 in San Francisco, California June 11, 2012. REUTERS/Stephen Lam

2/6 Craig Federighi, Apple Senior Vice President, Software Engineering, with a man in a racing suit, demonstrates Racer OS X during the Apple Worldwide Developers Conference 2012 in San Francisco, California June 11, 2012. REUTERS/Stephen Lam

Scott Forstall, senior vice president of iOS Software at Apple Inc., speaks about iOS6 and Siri during the Apple Worldwide Developers Conference 2012 in San Francisco, California June 11, 2012. REUTERS/Stephen Lam

3/6 Scott Forstall, senior vice president of iOS Software at Apple Inc., speaks about iOS6 and Siri during the Apple Worldwide Developers Conference 2012 in San Francisco, California June 11, 2012. REUTERS/Stephen Lam

The new Macbook Air Pro is pictured during the Apple Worldwide Developers Conference 2012 in San Francisco, California June 11, 2012. REUTERS/Stephen Lam

4/6 The new Macbook Air Pro is pictured during the Apple Worldwide Developers Conference 2012 in San Francisco, California June 11, 2012. REUTERS/Stephen Lam

Apple unveiled the new mobile operating system, a lineup of improved notebook PCs and lots more at Apple's Worldwide Developers Conference 2012. Here're some key moments.

5/6 Apple unveiled the new mobile operating system, a lineup of improved notebook PCs and lots more at Apple's Worldwide Developers Conference 2012. Here're some key moments.

Apple CEO Tim Cook speaks at the Apple Developers Conference in San Francisco, Monday, June 11, 2012. (AP Photo/Paul Sakuma)

6/6 Apple CEO Tim Cook speaks at the Apple Developers Conference in San Francisco, Monday, June 11, 2012. (AP Photo/Paul Sakuma)