Time Warner went and replaced our gear with 1ghz stuff last year. But they haven't bothered to deploy new set tops, nor DOCSIS 3. Maybe they'll do something useful with it by 2020.
I think TWC has bigger issues than just deploying Docsis 3. Running 1GHz may bring out issues in many older homes with RG-59U. I had an issue on 1 link in my house that is RG59U (DTV replaced the other 2 with RG6 a few years back). Worked fine on DTV - but TWC digital gear didn't like it. I ended up taking an old(er) RG6 that ran the long way around and works Ok.
Many 'older' houses may end up with issues similar to mine. This is probably similar to AT&T with old POTS wire having issues. -- Canada = Hollywood North