Here's some gameplay explanation for you then

Well as far as gameplay goes imagine the classic Batman way intergrated into a game. Fear and stealth. So there's a room with five bad guys with guns. You run out and they'll shoot you dead. So you creep up to the first guy and knock him out with a chokehold. Then you grapple up to an Arkham gargoyle. You swing to another one under which a guards stands and you zip down, knocking him out and hanging him from the gargoyle. You grapple hook away and one of the guards sees the guy hanging. He then starts moving around more cautiously, jumping back and turning randomly so you can't properly sneak up on him. So you head to a wall and plant small explosives on it. You get away and then throw your batarang at the wall to get his attention. He then goes over to the wall to investigate and you trigger the explosives when he's near enough, knocking him out. The noise makes the other two alert and they find each other and partner up. From the gargoyle you glide down to them and KO kick one, then disarm the other and knock him out as well. There are many different ways you can do things, that's just an example of how the stealth knockouts and fear mechanics work.

The enemies have different levels of how they feel, from calm to alert or something like that. The calmer they are the easier they are to sneak up on and the more alert they are the more they look around, be cautious and even partner up. In some cases you can't be seen at all otherwise things get blown up or people die and in other cases you can be, but because they have guns you'll get shot down without enough speed to escape or get them and whatnot. Imagine Metal Gear Batman

Then there's combat. Sometimes you'll be trapped in an arena like manner and need to fight through bad guys, at which point you're in freeflow combat where you can hit anyone, counter/dodge anything and take people out in many a way, just like Batman would be able to. As you go on situations like this show enemies being stronger, more in number and having weapons so even if you can counter anything doesn't mean you will. You can keep a combo going forever if you're skilled enough, one of the devs saying he got one of 150.

That's the important stuff I can remember anyway. There are quite a few gameplay videos around so check 'em out if ya want.

Since you took the time to type all that, I actually read it, and thanks for the info.

For the record, I was sold at, "think Metal Gear Batman."

It sounds like the combat will be quite deep, which is definitely not what I was expecting. I really thought it would just be a "beat-em-up" kind of title. I also like the stealth aspect, which is something I already expected.