Atlus has released the first full trailer for Etrian Odysey IV. View the two minute clip below. The clip's narrator is Rumi Hiiragi, voice of Chihiro in Spirited Away.
Also be sure and visit the game's official site, which has new background music and an updated gameplay section. The gameplay section shows that the game's monsters are now fully 3D models. As you explore dungeons, you'll encounter "F.O.E," which stands for Field On Monsters. These particularly dangerous beasts can be seen in advance, so you can avoid them.