The budget, compact long-zoom camera field must be a cutthroat one -- Nikon unveiled the Coolpix S6300 early last year, quietly slipped out the S6400 later in 2012, and it's already previewing a S6500 at CES. What's new that justifies such a quick refresh? WiFi, mostly: the S6500 should be one of the less expensive cameras in its class to share its photos directly over a local network. Photographers with self-conscious subjects also get five new Glamor Retouch modes that brighten cheeks, eyes and teeth. Otherwise, those who bought an S6400 will fe
