You have to remember that Longhorn is more than 2 years away. Whidbey, the next version of Visual Studio .NET, is currently in alpha, and already supports some of what Longhorn has to offer, including XAML (yes, XAML not XML). Most people won't hear of these types of features or the new Longhorn API until late in the beta/release candidate stages when testers and develolpers are no longer under the watchful eyes of non-disclosure agreements.