The sixth paragraph of the story "Apple jumps to a 5K display with the new iMac," posted to the wire on Thursday, implied that the thickness of the 27-inch iMac with Retina 5K Display is uniform. The iMac is only 5 millimeters thick at the edges.
The story has been updated on the wire and sixth paragraph now reads:
The new iMac has highly power-efficient LEDs and is 5 millimeters thick at the edges of the screen, Schiller said. The processor, power supply and other components are housed in a much thicker bulge in the center at the back, as in previous models.