The latest issue of Japanese game magazine Famitsu apparently has a two-page advertisement that teases Shin Megami Tensei IV. It's apparently headed for the 3DS.
The popular Japanese role-playing Megami Tensei series debuted back in 1987 with Digital Devil Story: Megami Tensei. The first Shin Megami Tensei game was released in 1992.
The ad reads Shin Megami Tensei IV in Japanese, but does not provide any details about the fourth entry in the Shin Megami series. Since the magazine has yet to hit Japanese newsstands, Kotaku is following up with Atlus, the game's developer, to confirm. This post will be updated should the company respond.