Release 2.0 is targeted at VS 2010.

VS 2010 exposes major new extensibility points:
1) Recorder plugins enable you to do custom correlations and other web test fixups as part of the recording.
2) Result viewer plugins enable you to add tabs to playback, opening up a lot of new possibilities including adding viewers for non-html content types.
3) Edior plugin enables you to provide edit controls for http post bodies.

In addition to providing useful examples of each of these, the release 2.0 carries forward the item templates from 1.2, as well as plugins that did not make it into the product.

Web Service Plugins
Added Web Test plugins for Web Service Messages. They handle XML, SOAP, REST, JSON and MSBin1 content types. The following is the list of plugins:
Visual Studio Addin – Additional tab in Web Test Result that shows Request and Response in hierarchical view side by side. Using this user can add extraction/validation rules on response messages and parameterize requests
Msbin1MessageEditor (IBinaryHttpBodyEditorPlugin) - Editor for MSBin1 request body
XmlMessageEditor (IStringHttpBodyEditorPlugin) - Editor for XML and JSON
WebServicePostRecording (WebTestRecorderPlugin) - Adds references to plugins automatically
XPathExtractionRule (ExtractionRule) - XPath based extraction rule that works with XML, JSON and MSBin1
XPathValidationRule (ValidationRule) - XPath based validation rule that works with XML, JSON and MSBin1
WebServicePlugin (WebTestPlugin) - Data driving for MSBin1

Ed.