I am not a lawyer, but if I am reading this correctly, it means
that beta version of the operating systems and SDKs are still
under NDA, but Apple allows developers to discuss new APIs and
features that have been introduced at WWDC in public. That should
cover pretty much all the new stuff in iOS 8, Yosemite and the
Apple has gotten a lot more open this week, and attendees (and my fellow members of the media) noticed and appreciated it.