During its WWDC keynote address today, Apple unveiled iOS 5, the latest version of its operating system for the iPhone, iPad, and iPod touch. The software offers over 1,500 new APIs for developers and over 200 new user features, including an all-new notification system, a new “iMessage” messaging system that will work across all iOS devices, enhancements for the Camera app, Mail, Safari, Game Center, integration with Twitter, a new service called News Stand that works like iBooks but is meant for magazines and newspapers, AirPlay mirroring, which will let users beam whatever is on their iPad to an Apple TV, wireless syncing with iTunes, and over-the-air software updates, that also allow iOS devices to be setup and used without connecting them to iTunes. Apple will release iOS 5 this fall for the iPad, iPad 2, iPhone 3GS, iPhone 4, and third- and fourth-generation iPod touch.

“iOS 5 has some great new features, such as Notification Center, iMessage and Newsstand and we can’t wait to see what our developers do with its 1,500 new APIs,” said Steve Jobs, Apple’s CEO. “Perhaps iOS 5’s paramount feature is that it’s built to seamlessly work with iCloud in the Post PC revolution that Apple is leading.”