It looks like we’re getting a new area to play in as ‘Goth Corp’ isn’t in New or Old Gotham IIRC. Another island? The blocked out area of New Gotham? It said open world in the DC All Access video, but will it connect to the existing open world or be a separate sandbox?
Regardless, the influence of, Batman: the Animated Series episode, ‘Heart of Ice’ is clear.
What other little clues have you picked up?