Very well done. These are excellent and I can't believe I'm saying this, but I actually prefer that dock to the current OSX. Unifying the app icons to a distinct shape really improves the overall visual quality of the dock.
At first I was going to offer criticism of finder's icon remaining the same, but I think I was mistaken. Having Finder be visually separate from the other apps makes sense.
I feel like minimized apps should be styled similarly with a different geometric constraint. Obviously square comes to mind. And the trash should have an updated, flat design that doesn't conform to the geometric shapes for apps and minimized windows.
Overall, I love it actually. And as someone who hated iOS7 at reveal it gives me hope that something awesome can come out of this current design language.