So it seems the rumors are true. While it wasn't unveiled in Nintendo's pre-TGS press conference, they have unveiled on their website a new analog stick attachment for the 3DS. The new peripheral will cost $19.50 when it launches in Japan on December 10th. It will have compatibility with the new Resident Evil, Metal Gear Solid, and Monster Hunter, amongst others.
Personally, I'm a bit baffled by the attachment, since it could potentially fragment the market and confuse developers. However, Nintendo is no stranger to specialized equipment, having already released add-ons like the Wii Balance Board and Motion Plus controller. However, I think that portable players will be a bit miffed about Nintendo's continuing revisions to the troubled portable.