WPF & D3D interop ... (WPF Textures?)

Starting with Windows 8 there have been some ways to better use WPF & D3D together...

http://blogs.msdn.com/b/windowsappdev/archive/2012/03/15/combining-xaml-and-directx.aspx

I'm mostly interested in the one using WPF as a 2D GUI solution for my D3D apps. In the link above it is shown that one can already use XAML as an 2D GUI overlay on top of D3D content.

Does this cover just the rendering part of WPF / XAML and will the controls be static or can we use Button, CheckBox, TextBox, etc. controls and they will react to input just as usual ?

(to clarify, I want to use WPF GUI content in D3D, not the other way around ... e.g. a WPF GUI on a D3D rendered cube including interaction with the GUI controls)

Are there any plans in the WPF D3D Interop roadmap to support rendering WPF to D3D textures and be able to use those in D3D scenes ? This would be a huge feature and I'd imagine a big amount of developers would like it.

Thanks