New Mac Pro:
Black cylinder with a motion sensor so that when you turn it around to look at the ports in the back, it lights up....
...and all expansion is external, mainly via 20 Gbps Thunderbolt 2 and USB 3.
Also comes with a PCIe SSD, which means transfer speeds north of 1 GB/s. Impressive.
Has two AMD FirePro GPUs, and can support 3 separate monitors natively, 4K each.