http://wccftech.com/apple-watch-series-3-nike-release-date-october/

Aside from the regular Apple Watch Series 3 models, the Nike+ versions have also been introduced just like last time. However, in order to purchase them, you will have to wait a while since they will not start selling until the month of October.

While Apple will start taking pre-orders for both the Apple Watch Series 3 Nike+ and regular Apple Watch Series 3 models at the same time (starting September 15), the former will be available until October 5 and that too in limited quantities. In terms of differences, if you prefer the aesthetics of the wearable to match your fitness gear and other paraphernalia, then you should entertain such a buy.