There are actually no Visual Studio “Orcas” development tools for the July CTP!
Your best bet seems to be perhaps the June CTP. For me this means foregoing decent NVidia drivers that actually work – so I’ll probably carry on with my WPF development on my XP/WinFx (.NET 3.0) Beta 2 machine for now...
http://blogs.msdn.com/tomarcher/archive/2006/07/17/668572.aspx
However, July CTP does have support for Media Center Extender on the Xbox 360 in countries other than the US ....