On the developer side RadCalendar comes with:
We have some exciting plans for and around RadCalendar, which we will be rolling out in Q3 2013, two of which are built-in range selection and easier integration between two or more calendars that will further enhance the multiple selection user experience.
Until then, you can download RadControls for Windows 8 HTML now and see RadCalendar in action. Please share your ideas and feedback on our feedback portal or write to us in the forums or via our support-ticket system. We are eager to hear your opinion and comments about this new control.
More info about the new and interesting stuff coming out with the Q2 2013 release you can find by visiting the blog posts below: