Microsoft has announced that a new skew of Visual Studio is being created for the 2005 version. This is Visual Studio 2005 Team System. This is not just a tool for developers, but rather an integrated solution for development. It incorporates the tools for architects, testers, developers, and more. It includes new control for tracking and versioning code and tasks (not just an update of Source Safe), testing tools with policies, architecting tools, designing tools (whitehorse), and more. In this skew, Visual Studio is actually more of a platform than just a tool.
I wrote a brief article on this that should be on CodeGuru. My article barely scratches the surface. In fact, the key to the article is the image that shows all the pieces within this product. Additionally, if you can get your hands on a copy of the Visual Studio 2005 Community Technical Preview, you will find some of the client tools for VSTS are included.