Kona, the guidance package from Microsoft Patterns & Practices for writing Windows App Store LOB apps (previously mentioned here: Application Guidance Update: Kona and Prism), has a new name: Prism for Windows Runtime.
Here are some relevant links.
Download from CodePlex:
A "Getting Started" article from Brian Noyes:
As a reminder, Prism for Windows Runtime and Prism 4 (for WPF and Silverlight) are different packages with different capabilities. As mentioned in previous article, this is primarily due to the differences in the underlying platforms and what makes sense in each environment.
If you build Line of Business applications, and you're moving into the Windows App Store world, it's worth checking out.