The new OS will ship in June (Fall for iPad, and a developer preview is available today) and has the following new or updated features:
• Multitasking
• Fast app switching
• Local notifications
• App folders
• A new Mail app
• iBooks
• Custom backgrounds
• Game Center
• iAd advertising
• 5x digital zoom
• Bluetooth keyboards

When the software ships in the summer, iPhone 3GSes and iPod Touch 3rd-gens devices will get all of the new features. The iPhone 3G and Touch 2G will get “many things,” which doesn’t include multitasking. I repeat: the iPhone 3G won’t get multitasking, ever. iPhone 2Gs will be left on a hillside somewhere to die of exposure, or something.

Apple is showing its true mobile colors. The company is on the lookout for an engineer who can help get its mobile-phone software onto additional devices.

On Feb. 15, Apple (AAPL) posted an ad on its Web site for an engineering manager “to lead a team focused on bring-up of iPhone OS [operating system] on new platforms.” Days later, Apple Chief Operating Officer Tim Cook called the company “a mobile device company,” echoing remarks by Chief Executive Steve Jobs, who in January said “Apple is the largest mobile device company in the world.”

The posting and remarks underscore Apple’s growing reliance on devices that provide Web access and computing features for users on the go. In the three months ended Dec. 26, the iPhone and related products accounted for $5.58 billion, or 36% of total sales, up from 25% of revenue a year earlier. Apple also sells other mobile devices, including the iPod Touch.

An adaptation of the operating system used in Macintosh computers, the iPhone OS runs the iPhone, iPod Touch music player, and the forthcoming iPad tablet computer. In the future, analysts say, Apple may put the OS onto Web-connected TV machines and devices that help viewers watch 3D programming. The Cupertino (Calif.)-based company may also consider licensing the iPhone OS to outside cell-phone manufacturers. Apple has shipped more than 75 million devices based on the iPhone OS, which lets users download and run applications such as games and calendars sold at the Apple App Store. Apple spokeswoman Natalie Kerris declined to comment.

Evidence continues to suggest Apple could soon introduce a new version of the iPhone operating system, this time with an alleged high-profile developer claiming their software was just updated for iPhone OS 4.0.

Rick Broida with CNet’s iPhone Atlas said Friday that he received an e-mail from a “prominent app developer” regarding an update to the iPhone operating system. “Just wanted to give you a heads up that we’ve submitted an updated app for the new iPhone OS 4.0 software,” the e-mail allegedly said. Additional details on the supposed software were not given.

Earlier this month, it was alleged that Apple’s rumored Jan. 27 event could include the introduction of iPhone OS 4.0. One report claimed the new software developer kit includes a “simulator” that makes it easy for developers to adapt to different screen resolutions.

Apple is widely expected to introduce its long-rumored tablet device at the event later this month. This week, one rumor claimed that Apple has not issued any updates for the iPhone in some time because the next version has many tablet-related references that the company did not want to leak in advance of its planned unveiling.

Also this week, one developer contacted AppleInsider when a single handset using iPhone OS 4.2 appeared in his Pinch Media statistics for an iPhone application. The identifier could theoretically have been faked, and it’s not clear why a new version of the iPhone OS being tested would skip the 4.0 distinction.