so must we buy that dongle thing for it to work?
You can use the DS lite/ fat backup manager, too.
will there be an update to it so we can get it from just the sd card like letterbomb in the wii?
After you used the Cardridge hack once, many things can be done (like starting the hack in the future from the SD but as far as I know you need the E-Shop version of the game
And where is the save file on the 3ds?
The save file of cartridges are on the cartridge and the saves of downloaded content are on the SD
is it on the memory or on the sd card, and cant we just change the .bin file for the hack to work?
No. First you have to dump the movable.sed on your 3DS, which contains the encription keys for the save files. Than you can use the SD card, too.
I know there will be piracy but i just hope it doesn't get out of hand, so if they release the hack don't tell your friends unless they are super close to you.
They will realize it earlier or later.
Just point of information