Today I discovered:

Clayface has a spinning attack that I have never seen before in my 17 years of playing the game, haha. You have to get CLOSER to him than the proximity that triggers his chest attack.

Bane can be attacked during the stalactite phase, he will then go right back into attacking you before the rocks have finished falling.

Alright, another new discovery today.

Now normally, when it comes to rolls Batgirl/Robin get the short end of the stick, but they have tech that is EXCLUSIVE to them. You can cancel their rolls with a punch or kick, and if you input them closer to at the same time, staggered just a little bit, roll-punch, roll-punch, you can start Z O O M I N G around. In case you're wondering, Batman/Nightwing's cancel comes out too slow to make this tech worthwhile for them; better to just mash the roll button in their cases.

Not sure about the viability of this little trick, but hopefully this is just the beginning.