A culprit of Apple's insistence on a combined completion date for just about everything. Xcode has similar oddities. Sometimes it feels like today's the date, it compiles, ship it. We used to call that Microsoft Beta.
I'd love to see them open up more around bug reports too, there's a lot of mystery and guesswork due to the closed nature of Radar. (Not to mention all the duplicated effort in Open Radar that tries to compensate.)