-City is 5 times larger than Arkham city
-One character is the equivalent of an entire environment in Arkham Asylum
-Arkham Knight is the name of the main antagonist of the game.
-Single Player only
-Gliding is quicker to accomadate for larger environments
-Things such as Gordon's trench coat and Batman's cape now have Apex cloth physics. They react realistically to changes in wind and movement
-When it rains beads of water run down Batman's suit tracing every groove
-The wrinkles on Gordon's face crinkle as he talks
-The city is as detailed as ever with realistic moving clouds with the moon shining through
-Halloween characters and balloons litter the street adding a creepy vibe
-Neon signs of the various shops shine brightly around the city
-The skyline has helicopters and blimps flying through it
-Arkham Knight takes place in a new central zone of Gotham City, which is split into three island and is in total roughly five times the size of Arkham City
-Rocksteady is emphasising the detail is more important than the scale of the world. They don't want to create the biggest open-world, they want to create the richest, densest and most vibrant
-Arkham Knight takes place one year after Arkham City
-Each villain has his/her own mission in the city and it's intended to spread Batman thin
-Scarecrow has threatened to blow up bombs in gotham and cover it with a new version of his fear toxin, so the city is ordered to evac
-Only criminals remain in the city; Gordon and his forces have been overwhelmed
-In the demo there are between four and five times the number of thugs in Gotham City than in Arkham
-Riots can feature up to 50 characters destroying things
-All of the game's cutscenes take place in-engine, there are no pre-rendered cinematics. They are seamlessly integrated.
-Batman can glide through glass surfaces
-He has throw counters that grabs enemies and launches them into another for double damage
-Hazards in the environment such as power generators can be mixed into combat
-Batmobile is designed to be "the best car in any game ever", it takes up around 160mb of memory in game and will just about fit in an
Xbox 360(if that was the whole game). There are hundreds of thousands of polygons, as well as textures and shaders used on it
It zooms to your location at the touch of the button
-It can do burnouts, jumps, boosts and "rotate in a circle at a full stop to get you pointed in the right direction
-It is bulletproof and can smash through barricades, trees and building corners
-Enemies will try and jump out of its way
-Driving gameplay is balanced with out-of-car gameplay so players don't just stay in it all the time
-While Batmobile has speed and damage Batmanhas a better freedom of movement and gadgets,
-Players can swap between the two based on what the job requires
-Batmobile can missile lock and fire an immobilizer at enemy vehicles
-Batmobile is designed to segue perfectly with Batmanand his navigational skills
-Kevin Conroy is going to be voicing Batman, Nolan North will be voicing Penguin, Wally Wingert will be doing Riddler, Tara Strong returns as Harley Quinn and Troy Baker will be Two-Face
From Game Informer (apparently, saw it on another forum with no link.)