Finally! According to Stuart Kent, program manager at Microsoft, the DSL Tools V1 will be a part of the Visual Studio 2005 SDK Version 3 at the first part of september.
I have now a long time waited for this release so we can build our own designers for Visual Studio 2005. Currently my company have a huge demand from our customers that our application should be more easily customized, and the DSL tools will really help us out.