Microsoft has always said Kinect will work with every Xbox 360, but the new black Xbox has a special trick move -- that ExtUSB-ish port marked Aux up there is actually a special Kinect port that handles both data and power for the new motion control system. That means you'll only need one cord to set up a new Xbox + Kinect system, while Xbox 360 original owners will have to connect over USB and plug in a separate power cord for the Kinect unit. And now you know.
Update: We just spent some quality time with the Stealthbox in person, and the real port is a tiny little bit different -- it's got an orange line above it. Check it below.