Amazon Japan has recently released the official box art for Naruto Shippuden 3DS (officially called Naruto Shippuuden Shinobi Rittai Emaki! Saikyou Ninkai Kessen!!). We posted a Naruto Shippuden 3DS box art a few days ago (also from Amazon Japan), but have thankfully learned that ugly thing was only a temporary placeholder for the one below! Looks more like the Naruto box arts we know and love!
The box art confirms that Sai, Shikamaru, Kakashi, and Sasuke will be in the game in addition to the five Kages (and Naruto/Sakura), however, it is unclear whether they will be playable. There is also a mystery person with black hair. From the looks of their headband, they seem like a criminal (and exclusive character to the game).
Naruto Shippuden 3DS is a side-scrolling adventure with 3D image projections. The game is slated to be released by Takara Tomy on March 31, 2011 in Japan. There is no word on a North American release at this time.