the list containing the spoilers that was said to have been leaked by one of Rocksteady's officials is right here
of course some of you can't read what it says because I don't want to ruin it for everyone but we will know once it First off Nightwing and Tim Drake/Robin are mentioned to be playable in the main story
And second, yes Scarecrow is the main villain and leading mastermind in Batman: Arkham Knight an NO because of how disfigured the character looks in the picture below, Joker is not coming back from the dead and ending up impersonating him like Black Mask in Origins, which means the Scarecrow Batman is at war with is the same Scarecrow that hasn't been seen in Arkham City since Killer Croc took off with him in Arkham Asylum and with Johnathan Crane/Scarecrow as the main antagonist in the final chapter of the Arkhamverse, Batman: Arkham Knight is where he is sure to put his master plan into action.
Now for his mysterious partner, the Arkham Knight
As Batman's ultimate enemy, the character was revealed in the spoiler to be either Bruce Wayne's father Thomas Wayne (resurrected and twisted to the edge of sanity), his father's clone or his own mixed with his blood, Talia's donor and with the personality and traits of three of the Robins that fought beside him in the Arkhamverse which would explain why the cast director of the game casted Troy Baker as the character's voice when he was confirmed to be reprising his role as Two Face from Arkham City and for how original the character was said to be For the Arkham Knight's army of thugs from Venezuela, they were said by Oracle to adress their leader as "The Arkham Knight"
To how Scarecrow and Arkham Knight could assemble an army of Black Ops soldiers from a foreign country could have been done with the help from someone with enough power and authorization besides the league of assassins and from what the intel from the sheet above has stated, the person that is rumored to help Scarecrow and bring the Arkham Knight into existance is the one character seen in the secret ending to Arkham Origins and was thought to have been killed in the end of Assault on Arkham is none other than Amanda Weller
Surely because of her fate in the end of Batman: Assault on Arkham that it does seem impossible for Amanda Weller to return in Arkham Knight but who knows, there is a lirrle chance that Deathstroke got through to her and the laser mark he pointed his sniper rifle at her head with was probably to get her to stop messing around with him and start acting more fair with him, surely her involvement in the game could help explain more on everything going on as she is rumored to have the Arkham Knight teaming up with the villains forming the Suicide Squad in the game and they are Deadshot
Deathstroke (who is said to be maskless)
Bane
and a new villain to the Arkham franchise known as Lynx (a formitable enemy to one of the Robins)
The Joker is confirmed to return but not exactly from the dead, only as one of Scarecrow's most frequent nightmare illusions formulated from his fear toxins and in flashbacks of previous Arkham Games
As for the Man Bat, he was said to be in the game as well as one of the boss villains that Batman takes on in the game
In the sheet, Gordon is rumored to be the one that takes down the Scarecrow while Batman is busy fighting another villain that Crane hired as his muscle
King Kraken
The villain that Batman discovered inside the Final Offer's theater is rumored to be the final boss in the Arkhamverse's final chapter where Batman has to fight him while in a cloud of Scarecrow's fear gas.
The last thing that all of you will need to know is that one of the characters in this game will die but I am not going to tell you who it is and if anyone has read the sheets DO NOT COMMENT AND SPOIL WHAT WAS WRITTEN ON IT!
To Find out for sure if the spoilers from the sheet are true, please stay tuned for more trailers to the game