Microsoft has relased first CTP of Microsoft Expression Interactive Designer code name Sparkle which runs with WinFx January CPT Release.
Expression Interactive Designer is a design tool used to create user interfaces for desktop, Mobile and web applications using Windows Presentation Foundation and XAML.You can try out its innovative features such as rich 2D & 3D graphics, animation, dynamic layout, data binding, style & template editing, and resource management by downloading it from following URL.
http://www.microsoft.com/downloads/details.aspx?familyid=ed9f5fb2-4cfc-4d2c-9af8-580d644e3d1d&displaylang=en&hash=M8J5SPD