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Unless you have a Japanese 3DS, you can not change to a Japanese region.
To change the language of a Japanese version of Animal Crossing: New Leaf on the 3DS to English, you need to change your 3DS system language. Go to the Home Menu, select "System Settings," then "Language." Choose "English" from the list, and the game will automatically adjust to English the next time you start it. Keep in mind that this will change the language for all applications on your 3DS.
Yes, the Nintendo 3ds has is on cards, but how ever the Nintendo 3ds is able to play normal DS games
No, 3DS games can only be played on a 3DS.
It has master quest, which is a mirrored, more difficult version of the normal game
Yes, they play normal DS games, and the 3DS has a camera, so it can.
Around the same size as the normal ds are!
Of course. The 3DS XL is just bigger. It can still play normal DS and 3DS games.
No ones sure yet, but the price should drop a couple of bucks near Christmas time hope this helps =) the 3ds price will change to 170 at august 12 2011
yes There is the origional for the GameCube and Ocarina of Time 3D for the 3DS
yes
No you have to have a 3ds