I can't see how Spider-Man will be any tougher than any other opening night show, to be honest.
They usually don't release any tickets they aren't using for invited guests until closer to the date. But maxxim is right, you just have to keep checking and hope to get lucky. Please realize they will most likely be pretty cruddy seats.
Good luck.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.