Playing on hard mode is the only way to play. It forces you to master the combat.
Changes to the combat:
RT is only used for crouch and takedowns now. I dunno if the new slide move can be used to lead into an attack.
The gadgets have all been simplified. LT LT is still batarang but holding LT and pressing each of the face buttons also uses specific gadgets. You have to unlock 3 but there are 2 available out the outset (The new battle explosive gel and the batarang)
I performed the dangling interrogation on a thug. It was satisfying. The amount of animations in this game is crazy.
Crowd control seems to have been nerfed in this game. There is a multi stun (Bat Swarm) move you can unlock that replaces the throw. On top of that there is a weapon destruction take down (I dunno if it works on melee weapons yet) and, my favorite, the ground batarang finisher. The batarang finisher is the combat move to get early game on harder difficulties. It helps you thin the field quickly and allow for fancier combat.
The stun move is now a critical move in your arsenal. Triple stunning puts regular enemies to the ground and stuns larger enemies. Great for finishing the last guy with the ground pound. The beat down with the regular stun is tricky to pull off on hard mode since there is always an enemy on your ass to attack you.
Ground pound has been nerfed. It takes forever to perform and it is harder to counter out of it. I keep making a mistake and doing accidental ground pounds (mostly do to my wires getting crossed on performing a batclaw).
Triple counters are so satisfying. I swung a guy like a hammer into his friends.
Thank god batman learned to catch objects. Too bad it doesn't work with the multiple counter (from what I have seen).
Armored guys and the knife guys are easy peasy compared to AA's.
Evasion is still as godly as it was in AA.
I still have to experiment with advanced free flow but so far I like it.
49x 75 ground pound bitches!
Gadgets:
Only tinkered a bit with the new gadgets.
You can slow the remote controlled batarang.
You want to upgrade your decrypter as soon as you can.
All the new gadgets are surprisingly useful in and out of combat.