The problem is that beyond events like WWDC, apple really has no place to discuss anything NDA'd - not just the iPhone SDK, but things like developer seeds as well.
I'm betting the iPhone SDK NDA will be lifted someday, just right now it makes zero sense.
This is only true if you ignore the entire gaming industry, where I can think of not a single successful platform that allows public discussion.
I hope that Apple eventually realizes that a healthy developer community is actually in their best interest.