There was a blog post about this http://oleb.net/blog/2014/06/apple-lifted-beta-nda/ http://oleb.net/blog/2014/06/apple-lifted-beta-nda/ Further, Apple agrees

There was a blog post about this http://oleb.net/blog/2014/06/apple-lifted-beta-nda/ http://oleb.net/blog/2014/06/apple-lifted-beta-nda/ Further, Apple agrees that You will not be bound by the foregoing confidentiality terms with regard to technical information about pre-release Apple Software and services disclosed by Apple at WWDC (Apple’s Worldwide Developers Conference), except that You may not post screen shots, write public reviews or redistribute any pre-release Apple Software or services.