A posting – which was very quickly removed – contained two useful pieces of information. The first is that the film will be in both 3D and IMAX (not surprising given that the Nolan brothers are involved). It's worth noting that this has now been denied, so treat it with a pinch of salt.
The second, and most interesting, is the first synopsis that I’ve read so far. And here it is:
"In the pantheon of superheroes, Superman is the most recognized and revered character of all time. Clark Kent/Kal-El (Henry Cavill) is a young twenty-something journalist who feels alienated by powers beyond his imagination. Transported years ago to Earth from Krypton, a highly advanced, distant planet, Clark struggles with the ultimate question ‘Why am I here?’ Shaped by the values of his adoptive parents Martha (Diane Lane) and Jonathan Kent (Kevin Costner), Clark discovers having extraordinary abilities means making difficult decisions. When the world is in dire need of stability, an even greater threat emerges. Clark must become a Man of Steel, to protect the people he loves and shine as the world’s beacon of hope -- Superman."
Pick the bones out of that.
It suggests that we will be looking at a very early stage of Superman’s career, just as he is getting used to the extent of his powers and the responsibilities that they bring. There might also be a more existential angle, with him questioning his purpose. Sounds interesting as long as – please God – we don’t get an emo Clark whining about how the hand he has been dealt is, like, so unfair while listening to Coldplay. No-one wants to see that.
There’s a also hint towards the film’s backdrop: “with the world in dire need of stability…” What could that mean? Could it be a reference to the financial crisis? Political instability? We know from the Dark Knight trilogy that the Nolans like to ground their narratives in topical realism, and that they haven’t been shy in tackling these sorts of issues before. We know what the “even greater threat” is – his name is Zod, and I’m hopeful we might get a better look at Michael Shannon this week than the cameraphone snap that hit the net earlier this week.