Well, the demo's out, and it's awesome. Especially the bit at the end, where you take down those 5 guys in the big room.
I found a couple of fun things to do at that part -
Get a ledge takedown on the walkway that is the right exit of the room with the glass ceilings for epic backbreaking lulz.
Batranging/Glide kicking the inmates off ladder edges knocks them out and looks quite humourus.
Also, for anyone who hasnt found out yet RB/R2 is the action cam for the batrang.