It is Superman, what is to develop? If there was one character just about everyone in the civilized world knows, then it is Superman. That is why it is so baffling that they messed it up the first time and it took years do even get that done.
The only problem with doing a Superman movie is that the people that would make the movie are those type of people that try to relate to Superman instead of just excepting who he is. They either can't believe someone like Superman could exist or even if he does they don't buy into what he represents.
If we get Superman back to fighting for truth, tolerance and justice then all will be well. I can just hope.