In an recent interview with the German PSP-Site PlaystationPortable.de Takeshi Arakawa, director and Yoshinori Kitase, producer of Dissidia: Final Fantasy explained why certain changes for Dissidia: Final Fantasy where made for the release outside of Japan.
The tutorial and base gameplay where shortened down to meet the demands of western players.
Takeshi stated: "The Japanese are an RPG culture, they don't mind to have tutorials lasting more than an hour. Outside of Japan players won't be so patient, so we reduced the tutorial length to 10 minutes."
He also mentioned: "The length of playing time till the credits was reduced from 40 hours in the Japanese version to 10 hours in the European and US version of the game. Content though, wasn't shortened and players will still need to play more than 40 hours to see everything. But the ending will be reached sooner for non Japanese players."
Again is was mentioned, that they would love to produce Dissidia 2 as sequel to the game.
The full interview can be found in the source.