It's only sold in pre-orders because Nintendo purposely do that to make it look like it's in high demand to create hype for their product. They do it with all their games, it's a known fact and nothing new. Plus the Wii-U look dated compared to Sony and Microsofts next console.
Daniel Bryan is my future husband! http://media.tumblr.com/tumblr_lqmczjD06s1qipitl.gif