Hideo Kojima tweet confirms the existence of the project.
A game in the Zone of the Enders series is in the works for the 3DS, according to a Hideo Kojima tweet.
The series features mech combat in a futuristic sci-fi setting. Previous games in the series include two action titles on the PlayStation 2, as well as a turn-based strategy spin-off on the Game Boy Advance.
Kojima doesn't give any specifics beyond the attached photo, which he says is from "Omori-kun's desk."