Detailed by Google, a bug was found in final testing for an array of Android Wear devices therefore delaying Android Wear 2.0 for all eligable device with the exception of the Fossil Q Founder, Casio Smart Outdoor Watch WSD-F10, and Tag Heuer Connected Watch.
Here’s the statement from Google that was provided.
"We have started rolling out the Android Wear 2.0 update to Fossil Q Founder, Casio Smart Outdoor Watch WSD-F10 and Tag Heuer Connected. For other devices, the update is currently being delayed due to a bug found in final testing. We will push the update to the remaining devices as soon as the issue is resolved."