You probably won't. This is .NET Core only. .NET Core is a cross platform slimmed down version of .NET and doesn't run Winforms or desktop WPF. Windows Store WPF is supported.
If they really wanted to they could open source Silverlight GUI framework. That was basically WPF lite. They can take out the video/DRM stuff and just put the GUI layer out there - it was ported to OSX so it's at least somewhat portable.
It would be nice to have something like JavaFX for .NET - resurrected Silverlight could be it.
