Last week we released the VS SDK for VS "Orcas" Beta1. You can use this lastest version of the SDK to build VS Integration packages and DSL Tools-based packages that target VS "Orcas" Beta1.
To get this version of the VS SDK requires access to the http://www.vsipmembers.com site.
James Lau blogged some of the details of this release.
Please check it out and provide feedback. The best way to provide feedback is via the Visual Studio section in the Microsoft Feedback Center on MSDN. You can use this link to access the specific area for Visual Studio feedback.
If you'd like to discuss the VS SDK or have questions about VS Extensibility, the best place to go for online help is the Extensibility forum on MSDN.