It looks very polished. But there are some serious problems with the icons (The same goes for Microsofts own leaked icons (Build 9201, fbl_awesome etc).
- They will be a nightmare for people with poor vision.
- Some aren't instantly recognizable.
- There will be inconsistency again. We got rid of the Aero/Vista/WM6 look with WP7 and Windows 8. Now there will be conflicting graphical styles yet again. You can't expect every app developer to update their icons to this new style. Granted, not every single developer adhered to the metro icon style. But alot of them did.
- The infographic icon style of original Metro has become ubiquitous. Alot of modern websites seem to follow this style.
- The hollowing of alot of the icons do not bring anything useful to the icons. They just look like that for the sake of being "pretty". Wasn't that the reason for ditching skeumorphism in the first place?