Prism for Windows Runtime which provides guidance on building Windows Store business apps using C# and XAML is now available in the following languages:
How to get Prism for Windows Runtime
The Prism library source code is available with the AdventureWorks Shopper reference implementation on the MSDN Code Gallery at http://aka.ms/prism-winrt-code. The Prism binaries are available on NuGet. Search for Prism.StoreApps and Prism.PubSubEvents. You need to NuGet Package Manger 2.1 or higher.
You can download a PDF version at http://aka.ms/prism-winrt-pdf.