I couldn't see it having a console-style power port on it. And look at that form factor. It would be insane for a portable, and those ports just seem unnecessary for a portable, especially considering the necessary portions are ON the handheld portion (cartridge slot and headphone jack). I would assume that the power port for the portable connects on the front, sliding frontwards into the dock.
Again, this is a devkit. The form factor of the final device is going to be quite different. And with this devkit, when the portable has the actual processors the portable will need all of these ports.
I think it's all one integrated device for the dev kit.
Well the Eurogamer leak said that the portable portion of the devkit docks into the base unit. That certainly can change for the newer devkit iterations but I really don't see anything which looks like a dock in that picture.
Again we could also be discussing a fake here.
Edit: actually looking at it again I can see that being the connectable dock on the back of the device. Not terribly important either way, considering it might not be real and we see the final product in 11 hours.