3DS hackers have figured out a way to let the handheld play games from any region, by using a loophole in the YouTube app to run homebrew code on the console.
The exploit involves placing some files on your SD card, changing your DNS settings on your 3DS, and then using the YouTube app which is available, for free, on the eShop.
The creators say that this won't permanently affect your console: simply change your DNS settings back and your console will be as good as new. That being said, Pocket Gamer takes no responsibility if you use this info and balls up your device.
The modern also say that this exploit does not allow for piracy, saying "these exploits run strictly in userland, meaning that we do not have full control over the console, and therefore cannot run pirated software".
If you want to try it yourself, check out this NeoGAF post and get the YouTube app before Nintendo removes it from the eShop (like every other app that allows for exploits).