I use the Macbook Air and have for years, upgraded almost yearly. The Air comes with some limitations that requires adapters, I currently walk around with TB-Ethernet, TB-HDMI, TB-VGA. I also have an adapter for COM-port, but that runs on a regular USB-A port.
If I wanted to upgrade to this computer, none of my older adapters would work. Not one. I could potentially get them to work via a USB'C-TB adapter and plug most of them in, but that would just look stupid..
This design, if accurate, seems rushed and not well thought out. I can understand adding one ore two USB'C ports for a slow transition, but to completely remove all others... strange decision.
I'm used to adapters, but not being able to plug in a regular USB-drive without having a adapter, that's where I draw the line.
I also question everyone that say they do this for thinness.. The Air has plenty of regular ports. Does Apple need to design a "pro" machine thinner then the Air?