A:Answernot much of an answer, but a lot of cable companies are not moving to 3.1 and staying at 3.0. they must be worried about fiber, which can do TV and phone too. at least it did in my last house.
A:AnswerI called 2 cable companies and they told me customers could no longer hook up 3.0 modems to their cable systems. I was told only Docsis 3.1 32×8 with a speed of 1gbps would be supported and any interference would be charged to the customer. I would suggest calling you're cable companies to find out acceptable modems and be prepared for new technologies.