Read original post by Kirupa Chinnathambi at BlendInsider
Almost two years ago, we set out on a path towards building a flavor of Blend that allowed you to seamlessly craft HTML, CSS, and JavaScript into Metro style applications. We are thrilled to announce that the final, released version of Blend is available for you to try out. As in previous releases, there is no more need to download Blend separately. It is now part of every VS download that targets any of the supported platforms. You can learn more from our launch blog post.
Download Visual Studio 2012 with Blend and Windows 8. MSDN Subscriber Downloads has several versions available, and there are free downloads available for non-subscribers.