As many of us noticed, at one point in the new Final Fantasy Versus XIII trailer, the Prince impales one particular soldier with one of his many weapons. This is no new thing to Final Fantasy, but the effect you are all now thinking of is, blood and gore. Click on the screen shots below to see the exact moment in the trailer.
Minor blood has been in Final Fantasy's in the past, like on Sephiroth's face at the end of FFVII and the tiny patch of blood on Cloud's shirt after being stabbed by Sephiroth in FFVII: Advent Children. Those fall under the ESRB Teen Rating for "containing minimal blood" (Click here for the ESRB ratings guide). What is seen in the Versus trailer is in no stretch of the imagination "minimal blood", but easily fits into the ESRB Mature Rating's "contain intense violence, blood and gore" category.
Final Fantasy Versus XIII will be the first Final Fantasy game to receive a Mature Rating if changes are not made. This may come as a surprise as the creators of Versus are also the team behind Kingdom Hearts, which has only gone as high as an E10+ Rating.
Note, this is not confirmation of a Mature Rating. Although, if the final retail version of Versus still contains this amount of blood and gore it will be.