Update: Nintendo disabled pre-loading for Paper Mario on the Nintendo E-Shop, so you cannot get access to the game any longer. If you started downloading the game/downloaded it already, it shouldn’t be taken away from you or anything. More on this as the story develops. Thank you KingBroly (NeoGaf User) for pointing this out. 

Original Story:

https://twitter.com/Electivirus/status/779262544288501760
Apparently, if you pre-load the digital copy of Paper Mario: Color Splash, you can play the game right now in North America. Very likely glitch in Nintendo’s E-Shop systems and will be fixed soon. If you want to play the game now and have a large enough hard-drive/extra space on your Wii U hard-drive, then I recommend you pre-load the game now in North America.