In addition to a trademark for a potential title, Square Enix filed a logo for Type-0 with "type zero" written in kanji. Usually, Square Enix just files a title like Nier or Tactics Ogre. Since Square Enix registered a logo too, this is probably bigger.
Square Enix’s 1st production press conference is just a month away. Perhaps, we’ll see Final Fantasy Type-0 popup there.