Apple has announced that it is delaying the release of the Apple Watch watchOS 2 operating system due to a critical flaw. watchOS 2, which brings new features including the ability to run native apps, was slated for a September 19 release, Apple hasn't given a definite date for when the operating system would be available.
Beta testers running the recent watchOS 2 build say that while sluggish, they haven't experienced anything dramatically worrisome with the OS. Apple's statement regarding the delay.
We have discovered a bug in development of watchOS 2 that is taking a bit longer to fix than we expected. We will not release watchOS 2 today but will shortly.