Batman: Arkham Knight actually reuses several assets from previous Arkham games in unusal ways.
Here's a couple examples:
(First one contains spoilers)
[spoiler]
During The Joker's Nightmare sequence, they're is a painting of Batman carrying the Joker's dead body (a scene from Arkham City). Well as it turns out the picture is actually concept art FROM Arkham City.
![[Image: nIEqNwd.png]](http://i.imgur.com/nIEqNwd.png)
(2:43 in video)
[/spoiler]
Also, the monitors of the Militia watchtower stations are actually recycled from the cryptographic sequencer from Batman: Arkham Asylum.
They're is plenty more and I'll update this page when I have the time.
Here's a couple examples:
(First one contains spoilers)
[spoiler]
During The Joker's Nightmare sequence, they're is a painting of Batman carrying the Joker's dead body (a scene from Arkham City). Well as it turns out the picture is actually concept art FROM Arkham City.
(2:43 in video)
[/spoiler]
Also, the monitors of the Militia watchtower stations are actually recycled from the cryptographic sequencer from Batman: Arkham Asylum.
They're is plenty more and I'll update this page when I have the time.