Syndicated from the TypeMock Announcement Forum.
We have released TypeMock 4.1.
A few of the new features included in this release are: 
Support of .NET 3.5 syntax changes
- Mocking automatic properties.
- Mocking Anonymous Types.
- Mocking Lambda Expressions.
- Verifying New Initialziers.
- Mocking Extension Methods.
- Mocking LINQ statements.
Integration API for tools developers
New API was released to ease integrating TypeMock with other developer tools.
Tracer Enhancement (Professional Editions)
The tracer tool has been enhanced with the ability to pause and resume trace gathering, the ability to resize its different panes, and the marking of the start and end of each test.
NCover 2.0 Support (Professional Editions)
The new release of NCover tool (2.0.1) is now supported and can be linked to run with TypeMock Support of Visual Studio Orcas Beta 2
TypeMock.NET can be run on Visual Studio Orcas Beta 2. Many fixes
More information can be found in the Release Notes