Thank you for your question, J.
As far as I know, the Visual Studio 2008 Registration Benefits page has been updated because Visual Studio 2008 has not been officially released. The current VS version is 2008 RTM and is still not available for purchase. Additionally, this site is maintained by Microsoft and we cannot update the benefits to a newer version on demand.
We have another Forum post on the topic. Please, review it and subscribe to it - we will post information on the new RadRibbonBar version there: http://www.telerik.com/community/forums/thread/b311D-bbcamd.aspx
the Telerik team