The PS4 Pro is like a double-decker sandwich. Twice the graphical power, and twice the physical layers as well compared with the original PS4. You can barely see the Blu-ray optical disc drive inside the top layer of filling. Sony's also keeping up a fine tradition of hiding the power button.
Around back, all your ports. The PS4 Pro uses a chunkier, PC-style power cable (like an Xbox) though the power supply is still thankfully on the inside. The PS4 Pro also uses faster USB 3.1 ports instead of USB 3.0.
Here's the easy-access hard-drive tray, if you want to replace your PS4 Pro hard drive. Sony won't say whether the SATA speeds have improved, so we don't know whether a solid-state drive would make a difference for game loads.