2. Scarecrow Is The Main Villain
One of the best aspects of Arkham Asylum was the Scarecrow, whose Fear Gas would induce some very curious visual sequences indeed. The last time we saw him, Scarecrow had just finished being munched on by Killer Croc, and if you dared to play the game on the highest difficulty, you were able to see that Crane was still alive, and clambering for the precious Titan formula. Various easter eggs strewn throughout Arkham City certainly suggest that this series isn't yet done with Scarecrow, even implying that he will be back with something somehow more terrifying than his Fear Gas. Deciphering all the clues suggests that it might be a compound that combines Fear Gas and Titan, and if this is true, it will mean that Arkham 3 will probably be the most terrifying and insane Batman game ever.