I don't mind refinement of the Metro UI, although a bit sad to see the side swipe features of Windows 8 go.
What I really hate is this wireframe design of the icons. It's just looks tacky and like something inspired by Android. It's going to look a complete mess next to the Metro 1.0 icons that MS won't bother to update, not to mention third party apps. Company logos like Facebook and Twitter translate really well to the Metro 1.0 style. I don't imagine they're going to adopt a wireframe design on their Windows apps.
The wireframe icons, in my opinion goes against everything Metro stands for. Almost to the same extent as skeumorphism. A favorites icon (star or heart) does not need to be hollow. It just brings visual clutter for the sake of looking "good". You can tell it's a star or heart because of it's shape. A clock icon however needs to be hollow because it needs something within it to represent the hour and minute dials. The Metro 1.0 icon style respects this and you only see wireframe where it's needed.