I'm don't like the idea of a Bruce Wayne skin because it feels like a sham. It's a hardcore Batman game first and foremost, and a playable Bruce Wayne in the story map or even plain challenge mode just seems like they're not taking their own game very seriously. It's cool to joke about Bat-Mite or Bruce Wayne skins, but it's another thing to actually implement the idea.
There are many alternatives: Armored Batman, New 52, Young Justice and so on, but just because you can do something doesn't mean you have to.
I didn't take the Bruce Wayne skin in Lockdown because it feels like a slap in the face to people. So they think Robin and Nightwing aren't good enough to fit into freeroam, but a leftover Bruce Wayne model of all things is good enough to throw into the map?