There now is a beta version available for Jazz / Rational Team Concert integration in Visual Studio. See this video for more information. I've seen the VS client in action at the RSDC. It's still pretty limited compared to the Eclipse based tooling, but good enough for developers to just work with the version system and some quick work item management. As with everything else involving Jazz the beta is available for download, but you'll need a free jazz.net account to get to it.