Re: Marketing fluff?
"Why the bump to 2Gbps, aside from a one-upsmanship towards Google? To fully benefit, I assume this means you'll have to use the ISP supplied router, since running such a device in bridge mode will basically lock you down to 1Gbps..."
It will be based on GPON, and the ONT (optical network terminal) box will likely have as many as 4 x GBE ports. So you won't be able to get all 2 Gbps via a single ethernet port, but it will be there. The ONT may be bridged or routed. As a cable operator, Comcast probably prefers bridged, as that is how DOCSIS works.
What is interesting, is that 2.5 Gbps is the maximum performance of a single GPON port. I wonder how many homes will be put on each port. The technology supports a maximum of 64.
Also the shared uplink is only 1.25 Gbps per GPON port, so this 2 Gbps service will not be symmetrical. Probably will be 2 Gbps down and 1 Gbps up.