While we can’t use it on our devices, it may offer some more insight into Windows Phone 7 Series and may reveal details that Microsoft hasn’t released yet. This build was extracted from the emulator that was released yesterday at MIX10. The build date is March 2, 2010 and it will only run on x86 machines. Maybe, just maybe, someone will be able to port this for our devices, but even if they can’t, it will give us something to watch until the official release.
Source: XDA-Developers