Update (2015-10-05): See the bottom of this post for ongoing updates on this teaser.
With the upcoming release of “Shin Megami Tensei IV Atlus Best Collection,” this week on October 8, 2015 in Japan, the official Shin Megami Tensei IV website has been updated with a teaser for an upcoming reveal.
The teaser is of a counter which states that a certain “Incident” will happen on the updated Shin Megami Tensei IV website once 15,000 tweets from it have been achieved.
Atlus released a trailer for the Shin Megami Tensei IV Atlus Best Collection greatest hits release on October 4th.
The “Atlus Best Collection” is a budget line label for Atlus re-releases. The latest game re-released with that label was the Nintendo 3DS RPG Shin Megami Tensei: Devil Survivor: Soul Hackers in March 2015 for 3,218 yen. A “The Best” version of Persona 4 Golden was also released on February 5, 2015 for 3,980 yen.
If it is not new DLC commemorating the re-release of Shin Megami Tensei IV, this teaser could potentially be related to an upcoming game that Atlus USA CEO Naoto Hiraoka teased they would be revealing soon at Tokyo Game Show 2015.
Update (October 5, 2:13 AM EDT): Two hours after the teaser on the website was unveiled, its image has been updated, slowly revealing itself.
Update (October 5, 3:00 AM EDT): The image for the teaser on the website has once again been updated.