It would probably be something that starts with 3, since the cartridges started production long before anything that starts with 4 was sent out. Keep in mind they have to make every cartridge, ship them out all over the world, AND give the stores and such time to collect the games and put them on display. The data they put onto the carts has to be ready months before the game is launched, hence why day 1 dlc and day 1 patches happen, the devs use this time for other stuff (this is also why day 1 dlc is okay but on-disc day 1 dlc isn't).