Red The Hunter
Member
It would have to depend on how far along with the localization they are. Unlike the last two trailers they can't just reupload this one with a few minor changes, since this one actually shows ingame text, especially not if it's going to be on the main stage for E3. They'll have to put together their own trailer.
TBF, FF15 when was shown for the first time was all in Japanese, also ATLUS USA has shown unfinished builds of games their working on that still contain Japanese kanji, like Persona 4 Golden for example.