Ridiculous. I have two Mac Pros as servers, and two of the biggest requirements is compatability and expandability. How can I add an expansion card to it, how do I add a second monitor? The prototype only has room for one HDMI out. The main reason you need to go desktop as opposed to laptop these days is to be able to customize your machine with additional cards, hard drives, memory, expansion. This machine doesn't look like it will do that. Pretty, but not very useful for its intended purpose.
The main hard drive is part of the motherboard, soldered on. You can't change it. I've changed hard drives in my current Mac Pros several times for faster and larger units to suit my needs. What do I do now when I need to upgrade the hard drive? Buy a whole new machine? Good for Apple, bad for serious customers. I'm leaving the Apple train.
I think this is another nail in the coffin of desktop machines!