Anecdotal data point, but as soon as Mountain View made it onto the list of possible Google Fiber deployments, we suddenly got bumped to 120mbit+ from Comcast,

Anecdotal data point, but as soon as Mountain View made it onto the list of possible Google Fiber deployments, we suddenly got bumped to 120mbit+ from Comcast, up from 60ish, all without any increase in price. Given that that's the only time I've ever experienced Comcast doing something for us that wasn't rage-inducing, I'm pretty sure it wasn't just a coincidence.