In an interview with the Playstation Blog, Final Fantasy XIII producer Yoshinori Kitase and director Motomu Toriyama finally confirmed there are no plans for DLC at the time, regardless of various rumors bouncing around the internet. Here's the information in their own words:
Question: I heard there was content removed from the original game? Could it possibly resurface as DLC?
Answer: Regarding the DLC content, we feel that the final product is 100% enjoyable…it’s the complete package. So we’re not planning any DLC at this time. In regard to the rumored cut content, we feel it was taken out of context. There are a lot of ideas that are brought to the table, and then the team takes the best ideas out of those, and the final product is polished that way. There was content that were “ideas” that didn’t make the final content, but the team isn’t looking to release that as downloadable content.
So, it means that when a company releases DLC for their games, it means their games are not 100% enjoyable, and perhaps on purpose? Maybe not having DLC are good news after all.