Unlimited Cruise SP is a somewhat special case. In Japan, the game was released with two episodes on a single cartridge with the Ford marine mode.
For the European release, we had to integrate the game in 5 languages (English, French, German, Italian, Spanish) and this has posed a problem to integrate two sets of cartridges 3DS available.
We tried various approaches without success (hence the delay for that matter) and in the end we are forced to include only the first episode. The rest is similar to the Japanese version: new characters, fashion Marineford, Japanese voice ...