They're similar to those for GameCube games, but friendlier.
Sure, we're getting really nitty-gritty nerdy with this one, but new systems are exciting. Even with something like the Wii U which could really go one way or anothing, it's easy to get excited about the little things. One of those little things? Box art.
The box designs for a few Wii U games have been revealed, showing a GameCube like arc at the top. Instead of the bold black of the GameCube boxes though, the Wii U cases have a nice friendly blue to them.
There's no word yet on whether Nintendo will be continuing its trend of white cases and whether or not they'll be shrinking down to Blu-ray sized packages like the PS3.
Source: Game Informer