If they are then the iPad Mini is going to have a camera on the back. The cutout might suggest a 3G model but it also might be there to free up the Wifi antenna (otherwise it would be blocked by the metal shell).
While you're looking at the photos, check out the bottom edge. It looks like this shell has the new smaller dock connector that is rumored to be on the next iPhone. Pretty cool, huh?
Next week is Apple's yearly Wordlwide Developers Conference (WWDC), so I'm sure some are expecting for this to be unveiled there. Not me; Apple likes to make a true spectacle whenever they unveil a new gadget, which is why they are all scheduled as stand-alone events.