Apple is moving forward with the new connection standards it has committed to. In a nod to the past it included one ADB port on the machines so you can connect your old mouse, keyboard, graphics tablet or other ADB device. At each corner is found a sturdy handle making it easy to move the machines around. If the Yosemite machines aren't as radical a design departure as the iMac was, they are still quite stunning in appearance. The Yosemite machines ship with system 8.5.1 installed which fixes some bugs associated with the initial release of 8.5.
Longer bars are better.