Expression Design is more oriented towards editing XAML and web graphics rather than print graphics (like Photoshop and Illustrator) and does not incorporate all of the raster image editing features of the original Creature House Expression.
The RTM news was announced at Microsoft's MIX 07 conference for web developers and designers.
[4] Expression Design requires the .NET Framework 3.0 as it uses Windows Presentation Foundation.
[7] A free copy of Expression Studio 4 (as well as older versions) is available as part of Microsoft's DreamSpark campaign to eligible students.
As of December, 2012, Microsoft has announced that Expression Studio will no longer be a stand-alone product.