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Now less than 24 hours away, PHONE Magazine is getting ready for Apple's iPhone SDK Roadmap event in sunny California which we'll be live-blogging from 10am PST. Apple described the event as concerning the "iPhone software roadmap, including the iPhone SDK and some exciting new enterprise features", and has sparked off the inevitable cavalcade of rumor and analyst prediction.

For instance, the SDK itself - a toolkit for developers to code applications natively supported by the iPhone (and the iPod Touch) and which would no longer require the handset to be unofficially Jailbroken - is suspected to be delayed; Steve Jobs originally promised its release by the end of February, and now the unconfirmed consensus seems to be that, while a beta will be made available at tomorrow's event, the full software package won't be delivered perhaps until WWDC in June.

Meanwhile, the functionality on offer in the SDK has cast doubts onto initial consideration of Jailbreaking as a temporary measure. Many believed the system of brute-unlocking handsets for third-party applications would only apply until Apple made such alterations official, but supposed leaks have suggested that the Cupertino-based company will maintain a far stronger grip on their platform than expected. While freeware is believed to be relatively free of Apple inspection, paid-for software will apparently require validation by the company and be distributed solely through iTunes; unsurprisingly, Apple will take a cut of each copy sold.

In addition, the extent to which third-party developers can access iPhone functionality is also in doubt; Apple is rumored to be preventing use of the dock connector and, perhaps, limiting interaction with other cellphone hardware such as networking and the camera. There is also uncertainty as to who exactly will be able to access the SDK at all; whether the package will be distributed free or paid for, and whether it will be limited to enterprise customers or released generally

Apple's mention of enterprise has reignited a wish-list of business-related functionality, and at the top of the list is Microsoft Exchange compatibility. With the inevitable adoption by corporate users (and AT however, we'd love for you to join us for the other half of the fun, as we live-blog the whole event direct from the Apple Town Hall in California, tomorrow morning, 10am PST.