"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."
You can read all about it at: http://www.apple.com/iphone/preview-iphone-os/
I'm sure they will put up the full video of Steve Jobs presentation and when they do, I'll link to that as well.
Here is a breakdown of the four features I think are the coolest. Too bad it won't come out for my iPad until later this Fall.
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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.
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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.
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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.
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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.
