Bit of backstory: So, my friends and I had a little get together last weekend since the weather had turned around. My friends were there, their friends, etc. And they're all involved in one way or another in the video game industry. Most of them work/ed for Sony in Foster City.
Anyway, so I'm talking my buddy who I hadn't seen in a while about Arkham Asylum and he tells me that the sequel is going to be awesome. I say I hope so and all that. And he says,"No. It is."
He asks me if he wants to spoil it for me. I said hell yes, I want to know.
The Point: He tells me they're going to "borrow a lot from" The Long Halloween and "work it around what they have set up" which is a huge section of Gotham is sort of quartantined off like you've seen in the teaser. Harvey Dent/Two-Face will be featured prominently. After that he refused to say more and would not answer any of my questions, the bastard, after teasing me like that.
I guess you guys can take it with a grain of salt, but I completely trust this dude. Granted this is coming from a friend from a friend from the UK, you know? Hell, even if it's just playful misdirection on his part, I think it's the right direction they should go in.
Personally I think it's a great idea.