I am going to add to this, but please do not get at all "excited", as I am still investigating the possibility - but I am currently planning on putting together an app for windowsPhone 8. I have been reviewing the code and information posted earier in this thread - I have been looking for the same thing, and as someone else said earlier - can't find it, build it
Right now I am planning on keeping the funcitonality somewhat simple, and similar to Radegast - text only.
If anyone is interested in helping, at whatever level, feel free to get in touch - and, obviously nothing will really start until after the new year.
J