Our cellphone-loving sister site PHONE Magazine has been invited to Apple's exclusive iPhone SDK Roadmap event today, 10am PST, and will be live-blogging the whole thing at http://live.phonemag.com/  We're expecting news not only of the SDK - which will finally allow developers to produce official third-party applications for the iPhone and the iPod Touch - but about new "enterprise features" that Apple is promising.  Does that mean support for Microsoft Exchange?  That's what the analysts are saying - in fact some believe Apple have been beta testing the corporate push-email over the past few months.

It's not all good news, though; rumor has it that the SDK - originally promised for February - has been further delayed, and that today will see a beta, not the full thing, released.  Plus, there are worrying rumors coming from trusted sources that Apple might be maintaining a whole lot more control over the iPhone's software and hardware than expected: current thinking is that paid software will need to be validated by the company, and distributed through iTunes (with Apple taking a cut of the profits).  There are also doubts regarding how much access to things like the cellphone radio software will be allowed.  Jailbreak was meant to be a temporary stop-gap, but it's starting to look as though it'll be here to stay!

Join PHONE Magazine at 10am PST (1pm EST or 6pm GMT) for the full announcement, as it happens, at http://live.phonemag.com/!