GREAT NEWS! The WinFX February CTP has just been released today and can be downloaded from here. Here is the readme document. This CTP has consumed a lot of customer feedback and thus brings quite a lot of breaking changes over the January one. The detailed WCF breaking changes can be found here. The changes include namespaces, APIs, configuration, setup, etc. Ed Pinto has a quick blog entry on this.
The biggest change to WebHost is that the .svc file format is changed. This was actually reflected in my earlier blog entries.
<%@Service language="C#" Debug="true" class="Microsoft.ServiceModel.Samples.CalculatorService" %>
<%@ServiceHost language="C#" Debug="true" Service="Microsoft.ServiceModel.Samples.CalculatorService" %>
You can also use the factory model to create your own ServiceHost with the following advanced syntax:
<%@ServiceHost language="C#" Debug="true" Factory="Microsoft.ServiceModel.Samples.CalculatorServiceHostFactory" Service="Microsoft.ServiceModel.Samples.CalculatorService" %>
The Visual Studio CTP for this WinFX can be found at this link.
The WinFX SDK is also released as part of the larger Windows SDK which includes pre-release documentation, samples, and tools for both Win32® and WinFX® in Windows Vista.