In the latest issue of Jump magazine, it was revealed that Dragon Quest Monsters: Joker 3 is in production for the 3DS.
Series creator Yuji Horii had this to say about the project:
“For the latest Monsters, it’s Dragon Quest Monsters Joker 3, a completely new entry in the series after a while. For the current announcement, I only have an illustration of the hero and logo, as well as a mysterious creature (laughs), but in addition to new systems, new monsters, and new communications, we’re diligently developing the game with all sorts of stuff.”
In addition to this, we know that Akira Toriyama designed the protagonist for Dragon Quest Monsters: Joker 3.
Jump also shows Nochora, the mysterious creature mentioned by Horii, that will appear in various scenes.
You can find a scan of the magazine below: