Bandai Namco had put up this site a few days ago featuring a countdown timer to December 4 in addition to something fans realized is a reference to one of My Hero Academia’s earlier episodes.
However as reported by Re: Zaregoto, the latest issue of Weekly Jump announced the project earlier than expected and is revealed to be My Hero Academia: One Justice (which fits the site’s URL abbreviation – MHAOJ). It sounds like a fighting game with destructible environments.
While no release dates have been announced, it’s coming to PS4 and Nintendo (hopefully next year). The trailer for this game will be shown off at the upcoming Jump Fiesta show, which will run from December 15-17.