Apple has officially announced that all new applications developed for the Apple Watch must use the watchOS 2 SDK or later from June 1 onwards. Presumably, applications which don't meet this requirement will not be approved by the App Store team.
Originally Apple Watch apps use the connected iPhone to execute all the codes and run the applications before streaming those results over-the-air to the Apple Watch. All this back and forth work caused a bit of delay. Apple has however changed this with watchOS 2 which was unveiled in October. This version of the smart watch OS allowed developers to build apps which ran natively on the Apple Watch itself. The upgraded operating system added more Wi-Fi support, which meant you could run apps, make calls and issue voice commands without the need for an iPhone nearby.
Apple is scheduled to hold its annual WWDC for developers from June 8 through June 12, 2016, where it’s expected to unveil watchOS 3. It could also unveil new features and improvements to the OS. For now, developers of new Apple Watch apps need to make sure their software runs natively under watchOS 2.
