The next numbered Neptunia game will be announced in 2025, Compile Heart confirmed in the latest issue of Weekly Famitsu.
The story, which continues from previous games, has been in the works for the past three or four years in collaboration with series illustrator Tsunako. The four goddesses—Neptune, Noire, Blanc, and Vert—will appear, and plenty of new developments will unfold.
A new illustration, likely for the new numbered title, is also published in the magazine, which our source for the information describes as resembling Honkai: Star Rail.
Thanks, Ryokutya2089.
