I don't see it in the beta, and I don't want to jump through ridiculous hoops (http://www.codeplex.com/wpf/Wiki/View.aspx?title=WPF%20Ribbon%20Preview).
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            No. According to the Project Manager for the ribbon project at Microsoft, in this forum post, the Ribbon control will be a separate deliverable from .NET 4.0.
                  Reed Copsey
                   2009-06-26 20:37:53