Idea Factory on the Unreal Festival Yokohama 2016 (October 2) announced the release of the next Neptune RPG game the Four Goddesses Online: Cyber Dimension Neptune.
The release date or the platform of the game is not clear but the new title going to use the Unreal Engine 4!

The official teaser website of the game already opened but at the moment you can’t find any information about the new game on it.
So stay tuned for more information!