WatchOS 2 to launch on Sept 9 at Apple Special Event
Apple has a special event scheduled in the week beginning Sept. 7 (predicted to be Sept. 9, but could change). It is evident that Apple will launch iOS 9 and the latest iteration of its Watch OS on this date or shortly afterwards, as they have been publicly testing the beta versions. iOS 9 has a bunch of new features for the iPhone, and it's even backward on almost every current iPhone and will provide a ton of handy improvements.
The new WatchOS is also a big upgrade because it will bring the first steps toward truly native smartwatch apps which is essential as the AppleWatch becomes more of a standalone device