said by Lazlow:From the Docsis wiki:
"NTSC 6 MHz channel spacing will allow 10 bonded 6 MHz channels as MAX spectrum allocation for DOCSIS3.0 data, 60 MHz spectrum allocation could increase with consumer needs and re-allocation of analog TV channels into compressed digital space, leveraging the capability of DOCSIS 3.0 infrastructure to allow for 1 Gbit/s speeds in the future."
So it would appear that they think D3 will be Gigabit capable.
I think that DOCSIS 3.0 is good implement to allow add channels be bounded but I hope new coming up with DOCSIS 4.0 as enhance improvement over DOCSIS 3.0 version.