FF's used to have very 'simplified', easy to understand language. Starting with FF12, I noticed a HUGE 'elevation' in language. I was surprised by the amount of huge words the NPC's were suddenly using compared to FF's of the past. I believe it may have something to do with their 'target audience'. Many of us that 'grew up' with FF are now old enough to fully comprehend the complex language.

Or, an alternative... they hired different writers.. or, different translators? :O

Sidenote: I notice a LOT of puns in the 'English' version of the game. "In for Garuda Awakening" ('rude awakening') is one example. How do these translate into other languages? Do they change it to a phrase that makes sense?