Microsoft has released the new SDK 8.0 update for the Windows Phone which has the version 8.0.10.322 which has a set of new Windows Phone Emulators that will be added for the development of Windows Phone application using Visual Studio 2012 or higher. The latest SDK update version requires the Windows Phone SDK to be installed first followed by this update to get the latest emulators for your development and testing. Also this update will be available only on VS 2012 update 2 or higher version with the Windows Phone SDK 8.0.
You can download the Windows Phone SDK update directly from the link http://download.microsoft.com/download/2/9/B/29B72168-7F53-4682-AB65-1FE2989467B6/WP8%2010322%20Emulators.msi