Cenk on the media team blogged about how to create a simple Metro app using standard video element that can consume Smooth Streaming content. You can check it out here.
Here is a short intro:
“In this post I'll cover how to build a basic HTML5 Metro Style Smooth Streaming Player using the IIS Smooth Streaming Client SDK Beta for Metro Style Apps. This basic application enables the HTML5 <Video> tag with Smooth Streaming in Metro style apps. “
Please check out the complete post here.