Currently the Windows Phone 8 SDK isn't public yet but once it is I will be making the necessary adjustments to support it. As for the 3rd environment are you referring to .Net? If so I plan on porting it to .Net in the coming months but there isn't current
support for it.
As for mondroid and mono touch that's really interesting and I'm going to take look to see how plausible it is to port the framework over.
At this point only Windows store apps are support (C#, C++/CX and HTML/JS) with the plan to support WinPhone when the sdk comes out (soon).