Y'know what. I like the idea of Malone as Carrie. But it does kinda screw with how the rest of the extended Batman family would fit in now. I woulda said Dick and Barbara were essential, but Carrie Kelley does kinda combine both characters (Young colorful Robin/female red-haired tech guru). To be honest, I'm happy for Snyder to just go nuts with his take on the DCU. He's already made decisions with Superman I wouldn't have which was my main sacred ground, so I'm less inclined to bur up now.
On another note, does the Flash casting decision seem a bit inspired by the kid playing Quicksilver in the X-Men films, or is it just me?