We cannot commit a concrete timeframe for the support of VS2010 at the moment. The current status of official compatibility for a beta
product like VS2010 means that we have tested our controls to ensure
there are no major issues with the new release, but it is still
possible that some bugs exist. We will continue to address these bugs
as VS 2010 evolves and once
ship, our "official beta compatibility" will become "official support" with the next regularly scheduled release.
That said, with the service pack release for WPF / Silverlight that is scheduled later today, the WPF / Silverlight controls will be automatically installed in the Visual Studio 2010 Toolbox.
As for Telerik Reporting - we would wait until at least a RC of VS2010 is available before we provide support for it.
the Telerik team