Are cable operators making fiber-fueled over-promises based on DOCSIS 3.0?

CableLabs' recently developed DOCSIS 3.1 spec is more than capable of delivering average downstream speeds far above 1 Gbps, but its ubiquitous deployment is still several years away. That means cable companies will have to rely on the current DOCSIS 3.0 parameters in what amounts to a marketing arms race with Google and AT&T's fast-proliferating fiber networks. Is this even possible? Do these guys have something else up their sleeve, like maybe offering FTTP to the finite number of subscribers who do order 1 Gbps service?