4. Red Hood Reference
The Arkham games help reinforce the image of Batman as the World's Greatest Detective, and not just a fighting machine he could, and possibly would beat his way to justice if given the chance, and we get some insight into the thought processes behind Bats' sleuthing in the BatCave in Arkham Origins. If you explore the cave a little (it's barely hidden,) you will discover the notice-board above, charting Batman's close attention to the Red Hood case, and revealing that the case remains open. This could be a major hint at some upcoming DLC, as Red Hood would be a great addition to the character roster, and that story arc would provide a good self-contained strand to justify a DLC pack. There's also a very similar looking wall in GC Police Department, with very similar links, which gives some insight into the relationship between some of the criminal characters in Gotham...
