[Update 13 March: added the Smooth Streaming Client SDK info]
The Microsoft Media Platform team has released the beta version of a Player Framework for Windows 8 Metro Style Applications. If you are building media applications for Windows 8 this is for you.
What is the Player Framework? The Player Framework is an open source video player available for Silverlight, HTML5, Windows Phone, Xbox, and now, Windows 8 Metro-style applications.
Update: in addition to the Player Framework you can now also download the Smooth Streaming Client SDK Beta from Visual Studio Gallery, allowing you to build Windows 8 Metro Style applications that consume On-Demand and Live Smooth Streaming content with PlayReady protection.
More on the Player Framework:
The beta release focuses on core playback scenarios and baseline functionality. In our next release we will add more advanced features including SMPTE-TT/TTML/WebVTT closed captioning support, Advertising support via MAST, VAST, VPAID, and Microsoft's Universal Ad Client, and a number of other advanced features.”
Download Smooth Streaming Client SDK Beta
Documentation: Getting started with an HTML/JS Player / XAML Player
More resources for Windows 8: