I hope you XAML and HTML5 enthusiasts are looking carefully at companies like Unity3D, NoesisGUI and Silverform.
NoesisGUI has plans to release their product by the end of 2012 with full support for Android, IOS, Unity3D and more. I joined their Beta program a couple months ago and was very pleased with the DirectX support currently available. They have promissed a Beta for July 2012 with Unity3D support and shortly after with Android and iOS support. http://www.noesisengine.com/