I'm betting they'll follow Frank Miller's (300, Sin City) Dark Knight I graphic novel. I always preferred Marvel to DC as a boy. I actually dreamt of working for Marvel as a young boy. I can still pencil pretty well too if I'm allowed to brag a little
Batman however is the only DC character I really liked and Miller's Batman the one I liked best of all.
I am still miffed at how the story lines have been mangled in the movies. Marvel is split between Marvel/Disney (Marvel Cinematic Universe), Fox (X-Men) and Sony (Spidey) and things are getting ugly. DC has been far less successful on the big screen but seems to be doing well on the small screen.
Supes vs Batman is crucial for DC. It is the lynchpin for plans to do Justice League. If this movie bombs, it's all over folks. I'm pulling for them.