15. August 2012 17:07
It took me WAY to long to find this out, so I am hoping this post helps Google/Bing provide the answer to others.
If you are used to using the following command to dispatch to the UI thread in Silverlight:
You are going to have to learn to love the new method:
Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, new Windows.UI.Core.DispatchedHandler(action));