Apple's newly released SDK build could potentially support background processes to allow for a richer user experience, and allow intricate applications to run properly. The Unofficial Apple Weblog reveals that the SDK supports the UIApplication delegate class, which includes methods that apply to gaining and resigning "active" status. While not officially confirmed in any documentation, the revelation could indicate support for background tasks.

The new SDK also contains support for NSXMLParser, while UIFont and Audio Toolbox have been rebuilt. Apple also dropped the "Aspen" moniker for the iPhone simulator.