In a move that is bound to surprise nobody, a search from CNET revealed that the DS App - which had a 3D model of a DS, with full functionality (minus games) of a DS - has disappeared from the iTunes App store.
At the time of writing, there's no word if app developer ZM2 Dev even knows of its removal as their website is still promoting its strong sales, and talking about future developments!
In addition, the YouTube trailer promoting the app has been removed with the message "This video is no longer available due to a copyright claim by Nintendo of America", pretty much stating that Nintendo wasn't happy with the infringement.
You mess with Nintendo, you get burned. When will they ever learn?