First thought that came to me exactly. It doesn't look like a robot...it's a dude in a suit. And yes Robocop is supposed to have once been a man, but in the first movie his original body was so badly mutilated that I assume they just used his head and brain. The rest of it was all robot.
He had to have more then his head and brain being a robot, since they had to feed him that past for his bio functions. So I assume much of his necessary organs are still present, and he can still digest food. I suppose they could have replaced his entire body, but it seems unnecessary to replicate certain of his bodies function with machines, if his organs were still intact.
I'm witholding judgement on the new movie until I see it in action though.