Originally Posted by ArmsHeldOut
That's not leaked concept art; it's just a fan made drawing of Affleck in a slightly modified version of the Nolan-universe Batman costume designed by Lindy Hemming.
Expect something completely new and different for the MOS sequel. Snyder has his own people -- his own costume designers. He won't be recycling concepts and ideas from previous films.
I think ArmsHeldOut is completely right. It's very good fan art (I like the way Affleck looks in the Batsuit in this drawing) but too much like TDK suit to be real.