Nintendo has issued an official statement on the Wii U box art images that appeared on Amazon's website earlier this week.
The design mimics the GameCube games boxes and uses a distinct blue colour to frame the artwork.
"Nintendo has finalized the design of the Wii U game box art, and many of our publishing partners have already incorporated it into their own game packaging. We are seeing those game packages online as retailers are starting to showcase their games.
"For details about a specific game's artwork, please contact the game's publisher. Nintendo-published game boxes will appear shortly with placeholder logos, and then ultimately with the final artwork for each game."