It may have been just a mistake by Apple, it could be the anticipation of a future feature: the AppleInsider found references to the presence of a camera on the iPad, in one of the documents intended for corporate users of the gadget.
The file in question is a PDF that comments on the possibilities of using the Apple tablet in corporate environments, available here in a corrected version (3.9MB). Before, however, one last item was on the list of available restrictions: “use of the camera”, as you can see in the image above and left.
The reference to a camera in this official Apple document may have been just a small mistake that would have abused “copy & paste” by relying on one of the iPhone reference documents (PDF; 2.2MB). There is only one point left with no: the text of this one is quite different from that of the iPad version. Mystery