from: http://www.engadget.com/2011/09/07/is-this-nintendos-3ds-joystick-add-on/:

End reports from the Japanese magazine Famitsu say that Internet has the scoop on Nintendo 3DS analog add-on we heard about last month. A page of the magazine (above) shows a cradle rather fleshy hugging the sides of the clamshell, stereo, R2 would add a touch more of a buffer circle to starboard. Plump devices may have been designed specifically for Monster Hunter G-Tri, a surprise (not confirmed) game that was released in the same issue of Famitsu makes no mention of updating the material reported that accompanied the last analog module on hearsay -. And price, release date and official confirmation of Nintendo still deserted area, of course.