Off My Mind: What Has Joker Been Up To & What Does He Really Know?

In case you haven't heard, Joker's back. We got a glimpse as to what he's been up to in last week's Batman And Robin #12. Even though that book's been out for a week, normally I still wouldn't talk specifics about it. But yesterday DC's blog site posted the final page so we can say the 'secret' is out there. Plus I'm sure you can find it floating around Comic Vine as well.
 
Another thing DC did yesterday was post the Frank Quitely cover to issue #13 (seen to the right). Seeing him is issue #12 was pretty crazy. We haven't really seen the Joker since Batman R.I.P. My questions are, what has he been up to and how much does he really know about Batman?
 
We can only hope there's an explanation as to why he recently took on another costumed identity. While it was a bit of a shocker, I'd hate for that to be the only reason, to shock us. I have to trust that Grant Morrison has a huge master plan in regards to Batman (and the Joker). The Joker's actions don't usually make sense but in his recent appearances, he seemed almost...sane. That's a real scary thought. I'm on the edge of my seat wanting to know what his motivation was to take on this identity. We've been seeing bits and pieces to the backstory of this "character" and it now feels like it's being thrown out the window. Again, I have to have faith that this was the original plan all along. I really have to hope that we will get clarification on this character's personal life and the recent troubles he found himself in.
== TEASER ==

The other question is does the Joker know that Bruce Wayne is Batman? This is a question that has been on my mind since R.I.P. If you recall or check out the image to the right, when Batman was trying to "save" Jezebel Jet, he had his cowl off. Even if the lighting wasn't good and Joker couldn't clearly see his face, she was yelling out "Bruce!" over and over. Everyone knows that being Batman costs a lot of money and how many rich young guys are there in Gotham named Bruce?
 
Also if you'll recall, shortly after this, Bruce passed out after getting a dose of Joker's poison and was buried alive by the Black Glove. We can assume that Joker stuck around for at least a bit of that before handing out his threats to the members, stealing an ambulance and being forced off a bridge by the Batmobile (being driven by Damian). In his recent guise, Damian even brought up Bruce Wayne to him. Maybe it's just Damian doesn't understand the concept of a secret identity but "Robin" shouldn't be openly talking about Bruce. 
 
On a side note, when Commissioner Gordon was in Wayne Manor and first ran into Damian, Talia was sure to tell him that "Damian is the son of The Batman." Since Damian has publicly talked to the board of Wayen Enterprises, we have to assume the world knows he's Bruce's son. So will Gordon be able to put two and two together?
 
What would it mean if Joker knew Batman's secret identity? Would it even matter to him? If anyone, Joker's the one to realize that Batman is the main identity. Who he was before he was transformed is irrelevant, just like who Joker was before doesn't matter. Joker wants and needs Batman as his nemesis. Batman is the only one he considers worthy to stand against him. Joker would never kill Batman because then his fun would be over. But would Joker use his knowledge of Batman's other life to strike at those he cares for? We'll have to hope that Grant Morrison gives us some of these answers soon.
 
What do you think? Does Joker know Batman is Bruce Wayne? Do you think he really cares who Batman is under his mask? Is the Joker's mind so messed up that it just won't register or make a difference?