Windows Phone 7.8 SDK is now available for download.What’s new in this windows phone SDK?
Windows Phone 7.8 emulator: This OS image emulates your app running on a 512-MB device running Windows Phone 7.8 (build 8858).
Windows Phone 7.8 256MB emulator: This OS image emulates Windows Phone 7.8 (build 8858) running on a 256-MB device.
If you’re running a Windows Phone SDK 7.1 installation, the update will also download and install the Windows Phone SDK 7.1.1 update onto your machine as part of the update.
