Indeed Kendo UI is platform agnostic. You can use it with any server-side technology which outputs HTML.
However we plan to provide server-side wrappers for various popular platforms. They would complement the Kendo UI widgets.
As a start we have just uploaded a NuGet package for Kendo UI Web which you can install from Visual Studio. We will provide a Ruby gem soon as well.
the Telerik team
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI