Just in case you missed this with the flooding of information on of VS2010/.NET 4.0 beta, there’s a separate WCF/WF 4 Training Kit available at the MSDN Code Gallery. Click here to download the Kit. Click here to download the WCF and WF 4 samples for the .NET Framework 4.0 Beta.
You may also download the updated VS 2010/.NET 4.0 Training Kit here.
Hope you can play catch up with all the products coming from MS!