We are pleased to announce that we just released Prism for Windows 8.1. Prism helps developers who want to create a Windows Store business app using C#, XAML, the Windows Runtime, and development patterns such as Model-View-ViewModel (MVVM) and event aggregation. Prism includes two libraries, a reference implementation called AdventureWorks Shopper, Quickstarts and associated documentation. This is an update from the version released in May for Windows 8. The guidance demonstrates: How to implement pages, touch, navigation, settings, suspend/resume, search, tiles, and tile notifications. How to implement the Model-View-ViewModel (MVVM) pattern. How to validate user input for correctness. How to manage application data. How to test your app and tune its performance.

via Just released Prism for the Windows Runtime on Windows 8.1 – Blaine Wastell – patterns & practices client architecture guidance – Site Home – MSDN Blogs.