I disagree with ALIT as far as the placement of the 3DS' camera; unless you have your fingers just smooshed onto the system, the camera should have at least one free lens at all times (remember we have like three cameras on that baby). Whether this should be put to a usage or not is debatable - on one hand it sounds like a huge gimmick (like motion controls), on the other it sounds like it could succeed (like motion controls). Either way I feel that it's another 60/40 split with most feeling the camera is negligible and/or detracting from the game experience and the minority claiming it to be the best thing ever.
If Nintendo does make use of the camera, I advise them to do so with minimal support...otherwise i t will become a failed application like the Game Boy Printer.