Nate True, iPhone hacker extraordinaire, has found that the iPhone 1.1.3 update shows signs of third-party app support. The update has prepared the iPhone and iPod Touch for native applications in many different ways.
First, the SpringBoard has been updated to show additional apps on additional home screens. Also, applications now share a decided “mobile” user account, and the preferences have been moved to a non-root directory. This hints that Apple will not be giving developers root access to the device, but instead will have a specialized account that allows for third-party apps. It is still to be seen how much access Apple will give developers with the SDK planned for a public release in February.