Was just scoping out the .NET 4.0 poster here when I zoomed in on core and saw...
![CropperCapture[2]](http://statestreetgang.net/image.axd?picture=WindowsLiveWriter/NewXAMLgoodnessin4.0_A2C0/CropperCapture%5B2%5D_thumb.png)
Looks like there's movement on making XAML more available to developers for serializing plain old CLR objects. Unfortunately, my Google-fu is failing me; I can't find any more information about what's happening here...