Another one of the development tools used in Windows 8 is XAML.
What is XAML?
Microsoft would define it this way:
XAML is a declarative markup language. As applied to the .NET Framework programming model, XAML simplifies creating a UI for a .NET Framework application. You can create visible UI elements in the declarative XAML markup, and then separate the UI definition from the run-time logic by using code-behind
files, joined to the markup through partial class definitions.
XAML directly represents the instantiation of objects in a specific set of backing types defined in assemblies. This is unlike most other markup languages, which are typically an interpreted language without such a direct tie to a backing type system. XAML enables a workflow where separate parties can work on the UI and the
logic of an application, using potentially different tools.
When represented as text, XAML files are XML files that generally have the .xaml extension. The files can be encoded by any XML encoding, but encoding as UTF-8 is typical.
In this video, Microsoft employees Joanna Mason and Unni Ravindranathan talk a little about how developers can use Visual Studio 11 to express their creativity when developing for Windows 8.
This was from the BUILD conference in Spetember.