We are currently about mid-way through our development for WPF Studio 2010.2 and we anticipate a release in September for it.
WPF Studio 2010.2 has some very major enhancements for our Docking/MDI, Ribbon, SyntaxEditor, Views, and PropertyGrid controls products. The main focus of the Ribbon enhancements is the Office 2010 theme.
We wanted to have it out by now but Silverlight Studio ended up taking a lot longer than expected to complete, and that pushed back our WPF development a bit. However we have been on WPF again for over a month now and are plugging along each day towards the 2010.2 release.
Hope that helps!