Here's the Schedule for Cox's Latest Speed Upgrades → Cox Speed Upgrade Schedule Leaked.

It would be nice if companies like Cox would just publish the information. Cox has this notice of double speeds coming soon on the Georgia section of their website, but no other information. Why bother if you are not going to provide any useful information?
That is one thing I like about most municipal fiber projects, they are more transparent about things like the deployment of speed upgrades and geographic expansion.