In September 2019, Warner Bros. released a short video celebrating the 80th anniversary of Batman's birth, which included a symbol that many took as a preview of a new Arkham game. The next day, another tweet with the symbol appeared, with the header "Capture the Knight," suggesting far more overtly that a new Bat game of some sort was in the works.

But that was it, until a new tweet appeared today with a partial new symbol.

Related images also appeared on Facebook and Instagram, which one Facebook follower combined:

It resembles the Gotham City Police badge, especially the eagle at the top and the laurel tree along the side of the shield. (Gotham's prominent clock tower was the Oracle's base of operations in the previous Batman: Arkham Knight film.)

Whatever it ended up being (another comment on Facebook suggested that it might be Argus's badge, but I think that's unlikely; it's a badge of the Argus, after all.)