Rumour: The days of importing and playing portable games from around may be over according to a Nintendo Japan's support service.
A NeoGAF member received a newsletter from Nintendo of Japan earlier today, that unlike the DS and DS Lite, the 3DS console will employ region codes in both the hardware and software, preventing players from running games from regions other than their own.
There are no Region codes in DS and DSlite. But DSI, DSILL, 3DS has Regioncodes. The Region Codes are installed in each games and the 3DS itself. If the codes dont match, you cant play.
Nintendo has yet to officially confirm the region locking, but with the DSi, DSi XL(LL) being tied to a specific region, it's likely that the 3DS may follow suit.