So, you and me all know about the amazing iPhone OS 4 is coming this summer season from the State

I means I have to change my iPhone 3G to a iPhone 3GS, or wait for the iPhone 4G coming somewhere this year or next

I got these Screen-shots showing off the new developer preview build of iPhone OS 4.0 have begun to appear online, including a number sent to iLounge by an anonymous source. Included below are shots illustrating the new multitasking and folders features, as well as the revised Photos app, universal mailbox, location services management, and more.

100+ New User Features

With iPhone OS 4, iPhone owners will enjoy over 100 new features that make it easier to interact with apps, manage email, read books, and more. New features include the following:


  • Multitasking

    Developers will have access to seven multitasking services, which will allow tasks to be performed in the background while preserving performance and battery life. So you’ll be able to make a Voice over IP call while playing a game or checking email, find a restaurant on Urbanspoon while listening to Pandora, and more.


  • Folders

    Organize apps into folders with drag-and-drop simplicity. Get faster access to your favorites and browse and manage up to 2160 apps at once — many more than the current limit of 180 apps.


  • Even Better Mail

    See messages from all your email accounts displayed together in a unified inbox, switch between inboxes more quickly, organize messages by threads, and even open attachments in third-party apps.


  • iBooks

    The best way to browse, buy, and read books on a mobile device. Easily flip through the pages of a book you’ve downloaded from the iBookstore while listening to your music collection. Browse tens of thousands of books — many of them free — by title, author, or genre. You can even check out reviews and read sample pages before you buy.

  • iPhone 4 SDK with developer tools.

    Developers

    With a rich set of over 1500 new APIs, the iPhone SDK 4 provides developers with a broad range of technologies to enhance the functionality of their iPhone and iPod touch applications. Developers can use these new APIs to make their apps more powerful, more feature rich, and more amazing than before. They can even use new GameKit APIs to develop for Game Center, the social gaming network Apple will launch later this year.

    Learn more about the iPhone Developer Program
    and iPhone SDK 4

  • iAd

    iAd is a breakthrough mobile advertising platform from Apple. With it, apps can feature rich media ads that combine the emotion of TV with the interactivity of the web. For developers, it means a new, easy-to-implement source of revenue. For advertisers, it creates a new media outlet that offers consumers highly targeted information.

  • Enterprise

    iPhone OS 4 offers more useful features for businesses. With enhancements to security, scalability, and compatibility, IT managers have even more reasons to deploy iPhone throughout their enterprises.

    Learn more about the enterprise capabilities of iPhone OS 4

iPhone OS 4 Compatibility

iPhone OS 4 will work with iPhone 3G, iPhone 3GS, and the second- and third-generation iPod touch this summer, and with iPad in the fall. Not all features are compatible with all devices. For example, multitasking is available only with iPhone 3GS and the third-generation iPod touch (32GB and 64GB models from late 2009).


  • iPhone 3G

  • iPhone 3GS

  • iPod touch
    2nd generation
    (late 2008)

  • iPod touch
    3rd generation
    32GB and 64GB
    (late 2009)
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