I have a normal WPF MVVM-Light application, that I tried opening in Blend (first time I used Blend for Visual Studio 2012 on my Windows 8 machine).
However, I'm not able to open the Design View, which pretty much renders Blend useless.
One issue I read was that it happens when your application's Output Type is set to Console, which isn't the case for me. Anyone else seen this?
Apparantly, Blend included in VS2012 only supports Windows 8 Apps.
However, there's a preview been released for Blend + Sketchflow that allows other platforms here :
http://www.microsoft.com/en-us/download/details.aspx?id=30702