As for the succubus comment, looking at the full context of his statement it doesn't look like Rucka's aiming at a "sex for power" angle with her so much as Kate going more for nice and friendly as an interrogation method rather than Batman's "scary bat-god" modus operandi.
I'm also intrigued by Rucka's statement that: "I have tried to make her even more brutally efficient than Batman. Batman tends to punch people in jaws, Kate breaks elbows, she goes for joints, she takes you down really quick. When she throws that switch she doesn’t mess around." That would fit with Scottyquick's theory of Batwoman being ex-military, because that sounds like textbook military martial arts.