The Wii U needs all the help it can get to shift units, and that’s why Nintendo is focusing on its much-loved first-party IP to sell the machine. The next game to get the Wii U treatment is Mario Kart 8 at the end of May. It looks great as the first Mario Kart to sport HD graphics, and it also looks like Nintendo is planning to bundle the game with the Wii U.An image has leaked of the box art for this new bundle. Nintendo isn’t confirming it exists of course, but does anyone really doubt that it does? In fact, I think gamers would be more surprised if Nintendo didn’t create this bundle as it just makes sense.The existing official bundles: one containing The Legend of Zelda: Wind Waker HD, and the other Mario & Luigi, both can be picked up for $299.99. I expect the Mario Kart 8 bundle complete with a 32GB black Wii U to match that price, especially as Nintendo has made it clear we won’t be seeing a hardware price drop before 2015. However, saying that, a $249.99 Mario Kart 8 Wii U bundle would be great to kick off the summer with.If you already own a Wii U, then I’m sure Mario Kart 8 is on your buy list come May 30. The gameplay is more of the same (not a bad thing), but there are going to be anti-gravity sections to mix things up a bit. You can also play online against up to 11 other players, and use Mario Kart TV to share clips from races through Miiverse.Even if you don’t like the gimmicks that surround the racing, this is a 60fps game with HD graphics running on a Wii U. Highest quality game yet seen on the platform? Probably.