Ever the purveyor of cryptic teases ahead of a game's eventual release, Square Enix has opted to give people notice of one such game announcement beforehand. The company stated on their page for Tokyo Game Show 2016 that they will be revealing a game in development there.
Claiming that the game in question is an action title, Square noted that the game's reveal would take place during their presentation on September 15th at 13:00 JST. A livestream of the presentation will be available at 13:05 JST on September 18th.
At this time, Square has not provided any more details on the nature of this mysterious action game.