Apple Watch to off load complex processing to the iPhone
The complex functions are sent from the Apple Watch to the Apple iPhone, and then sent back to the Watch using Wi-Fi. For example, some of the health data picked up by the sensors on the watch will probably get sent to the iPhone for analysis. The final result is then zapped by a Wi-Fi connection to the timepiece. In addition, Apple Watch users will be required to install an app that will help download apps and alternate watch faces, and also take care of the watch settings. This app might come with the release of iOS 8.2 or iOS 8.3.
The Apple Watch is expected to be released early next year, priced at $349. Apple has been showing off the device in France for Fashion Week there, but the watches on display are running a video instead of the OS, suggesting that Apple has some more work ahead of it when it comes to its timepiece.
source: ABlogToWatch, 9to5Mac via MobileSyrup