They can be downloaded right now!
3D trailers for various Nintendo 3DS games that were shown during Nintendo's conference last month, are now available for download on the North American, European, and Australian eShops.
The icon to enter the section with the trailers is featured on the front page, where it is labeled Nintendo 3DS Conference 2011 in the European and Australian shops and Upcoming Games Preview in the American one. The games that feature new trailers are Super Mario 3D Land, Mario Kart 7, Paper Mario, Mario Tennis, Luigi's Mansion 2, Animal Crossing and Kid Icarus: Uprising (the last one is not available in North America).
Icons for the trailers on the home screen also feature their own game-specific art. Previous trailers downloaded to the system used a generic icon. When viewing the trailer, an option to sign up for notifications is available on the lower screen.