So after a long wait these are available now and I received mine today. I opted for the metal one and not the plastic one. First of all it's a beautiful piece of work and the metal one has some substantial heft to it. It differs a bit from their previous MBA docks because the power is now on the bottom along with the majority of the other ports so it can be made permanent, which is nice. The connections are all held in with set screws and they include a screwdriver, so you can get the alignment of everything perfect. It also allows you to remove cables you don't need, for instance I removed one of the display port cables and the audio cable. It's just less stuff you need to align when putting it in the doc. Anyways here are the pictures which should explain most things but if you have questions let me know.