Like to import games for your Nintendo DS from the US or Japan? You might be out of luck if you planned to do the same thing with the Nintendo 3DS. Thanks to a poster on NEOGAF, and Ruliweb, an e-mail said to be from Nintendo's Japanese support claim that "DSI, DSILL, 3DS has Regioncodes" (DSiLL is the Japanese name for DSiXL) and that "The Region Codes are installed in each games and the 3DS itself."
Just a rumour so far, of course, but considering the region locks on DSi and DSiXL it wouldn't be very surprising.