I wrote a review on "Man of Steel 3D IMAX":
http://gamrconnect.vgchartz.com/thread.php?id=154457&page=22
It doesn't spoil anything, even though it might seem like that to anyone who hasn't seen it yet.
FYI Superman also kills a lot of unborn babies, and I still didn't spoil the movie at all, which you already know if you have already saw it.