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Apple CEO Steve Jobs will unveil the Mac OS X "Lion," build, iOS 5 and its highly anticipated iCloud Web-based services offering during a keynote address at the Apple Worldwide Developer Conference June 6, the company confirmed.

The news, revealed via a brief press release May 31, is a rare preannouncement by a company whose announcements are typically cloaked in secrecy, which caught media and industry analysts by surprise.

However, it is believed that Apple wanted to properly level set expectations after rumors and speculation about the alleged iPhone 5 reached a fever pitch in the past few weeks.

Top tech blogs such as TechCrunch and Daring Fireball assured the world that no new hardware would be unveiled at WWDC, but other, less reliable sources swore an iPhone 5 was indeed part of the mix. The popular blogs won that bet.

Apple promised that at the show, Mac developers will learn how to develop new Mac OS X "Lion" applications, while mobile developers will "be able to explore the latest innovations and capabilities of iOS and learn how to greatly enhance the functionality, performance and design of their apps."

As interesting and vital as Mac OS X and Apple iOS are to millions of developers, it’s the iCloud service that will get top billing at WWDC.

Apple has been rumored for months to be building a Web-based streaming music service to complement iTunes and help the company better compete with hosted consumer services from Google and Apple.

The idea is that consumers would procure music and other Web services from Apple’s server clusters. The company even admitted its new data center in North Carolina was ground zero for its new cloud services.

For more, read the eWEEK article: Apple iCloud Targets Google, Amazon at WWDC.