Writing Windows Phone Runtime Components in C#?

Question

Is it possible to write Windows Phone 8 Runtime Components in C#?

Answer 1

It should be possible according to these articles, but sadly only project template in C++ is currently available for Windows (Phone) Runtime Component:
Creating Windows Runtime Components (Windows 8)
Share using Windows Runtime Components (Windows Phone 8)

Answer 2

It doesn't appear to be possible at this time.