Didio revealed the concept:
I’m a longtime fan of the Metal Men and had a chance to write them briefly in the anthology, Wednesday Comics, several years ago. With this new series, we explore the essence of what makes the Metal Men human, by having them caught between Doc Magnus, the man who created them, and, the newly introduced, The Nth Metal Man, the being that gave them life. What I’m enjoying most about this book is the chance to stay true to all existing stories, while building out their mythology in exciting new directions.
With Davis adding:
I introduced Superman to a new generation in Superman: Earth One and heard from fans that they truly cared about our perspectives on Clark Kent and Superman. Dan and I have a goal on this new Metal Men series to give everyone a quality, entertaining story riffing off modern sci-fi narratives in a way that can only be done at DC. Hopefully fans will like our take on artificial life and find the unexpected humanity in these robots.