I saw this while I was checking out the news this morning (actually a few mornings ago on the 16th).
But it does show up, and only a few days late. Below you can find some helpful links. You need to update your phone to iOS 9 before updating your watch.
Updating - http://www.imore.com/how-download-watchos-2
More info - http://www.imore.com/apple-watch
Feature walk through (very nicely done) - http://9to5mac.com/2015/09/21/watchos-2-apple-watch-feature-walkthrough/
Technical Spec’s - https://support.apple.com/kb/SP717?viewlocale=en_CA&locale=en_CA
However, I cannot report how my update went, as I am in the boondocks (wait, actually here) and what wireless we get is less then ideal. And there is no phone service at all so I cannot use that trick.