As you can see in the images below, on the left is the old Windows Phone logo, and the right are the new square designs. It seems a lot like the recent change in the Chrome browser icon, moving from a shiny 3D sphere to a flat, minimalist logo. And, it is a good move on both accounts. Google is known for minimalist UI, and Windows Phone Metro UI is built on minimalist tiles. In both cases, the logos moved towards styles that make more sense for the products.
What do you guys think?