It seems Kendo UI mobile already covers Android and iOS. Are there plans to incorporate Windows 8 into the roadmap? It would be very appealing to developers if there is one framework that can be used across all platforms.
Windows Phone 8 support was delivered in Q1 2013. For Windows 8 proper, I can point you to Telerik's Rad Controls for Windows 8, which should help for Win8/Metro-style app development.
I just want to mention this related thread ("Kendo UI on Windows 8/WinR"T) on the KendoUI Forum: http://www.kendoui.com/forums/ui/general-discussions/kendo-ui-on-windows-8-winrt.aspx