Allow me to summarize the four ages of comicbook history in nerdcore free verse, just as a further touchstone to the way Morrison explains it. I've written one double-sided line per season:

"The Superman will Come, and he will be super (strong beyond imagining)...
The Superman will come, and he will be a man (emotions as frail as everyman)....
The superman will come, and when he does, it will change everything ...
The Superman will come... unless he is here already."