A quick inspection of the side of the MacBook Pro with Retina display reveals loads of upgrades:

MagSafe 2

Two (!) Thunderbolt ports

The first of two USB 3.0 ports

A standard 3.5 mm headphone jack (boo)

The right side of the MacBook houses an SD card reader, the second USB 3.0 port, and a full-size HDMI output.

Both sides feature air induction vents for the new cooling system—but more on that later.