I'm not sure why you're waiting. Remember "I agree they should not be going to Africa on a whim?" Are you reading my posts at all, Nathan? I've posted my idea a few times by now, but perhaps it will be more clear if I address the entire process logically.
1) What is the goal of a Superman Game?
For people to have fun being Superman.
2) What is so fun about Superman?
Well, he's crazy powerful, and he flies, and he's a really inspirational moral figure.
3) How can we turn those things into gameplay?
Well, environmental destruction is always a good way to show power. Giving him charge up/build up moves with great effects. We can give him his powers from the comics for utility. The well reviewed thing from SR was the flying, we may want to adapt that, and it also felt powerful, it just needs improved controls. Being inspirational is more of a challenge, perhaps a branching storyline Bioware-style decisions in the storyline.
4) What are the challenges that will make that Gameplay more fun?
Well, for him to feel powerful, you need to put him up against very powerful enemies, who also have great environmental destructive power to show their greatness. Kryptonians, Alien Invaders, Scientific Monstrosities and combinations thereof. There can be challenges perhaps in bosses or perhaps rescues, that can't be punched away, and require use of one of his many powers.
With the inspirational stuff, it can't be making bad guy/evil/renegade/whatever decisions, that's not what makes Superman great/fun/cool. Use decisions that have no right answer. Real moral dilemmas where either decision can be defended. That way you hearken back to what made Silver Age Superman stories great.
5) Where Should we Set the game in order to deliver all that great gameplay?
Well, it can't be Metropolis, because there you have to keep the bad guys and Superman from causing too much destruction, or random destruction (can't have them take out the Daily Planet).
We need somewhere he can cut loose. Somewhere with a plethora of alien monstrosities, a target for both Kryptonians and Luthor. Apokolips is a great idea, but all things there are of Darkseid. On War World, you can even use War World's gladiator/arena premise to fuel Superman being a powerhouse and keep a steam of combatants coming at him all over a war torn destroyable planet. You can even blow up the planet at the end for a truly epic finish.
6) Are there any technical obstructions to overcome?
Well, yeah, creating a planet. Fortunately, such things can be done with procedural generation, assuming, of course, that you're not trying to add in a lot of detail to everything, you can have a tiny planet full of landscapes and hand design the arenas (whether they look like arenas or not) that the fights take place in.
7) Can we tell a good story in these logical limitations?
War World? Superman? Big fights? Deep moral dilemmas? Lex Luthor with some plot involving War World's otherworldly resources? Travel, rescue puzzles and moral dilemmas for pacing between epic boss fights? You bet your bottom dollar we can.
So while you're clinging to the discredited idea of a constant fight scene in order to keep Superman in Metropolis, I'm waiting for you to take apart my actual idea, so I can make it better.