Apparently there are people who will believe that a software upgrade will make your phone waterproof. The “Preview for Developers” application for Windows Phone doesn’t actually turn your phone into a Tardis, but it does allow it download future versions of the Windows Phone operating system for testing. That way you can make your applications work with the latest versions of Windows Phone before they are released to the general public. It also means that you can use upcoming new features like Drive mode and application management.
You can now terminate applications from the the App-Management screen (hold down the Back key to open this). Although why anyone would want to terminate the wonderful VoiceMusic application is a mystery to me.