Introducing Cox Gigablast

They just pulled the fiber cable to my house and excitement is building to concern. My house is pre wired with cat 6/u cable and rj45. This all feeds to a central box in a closet downstairs middle of house. My cable modem and router are in closet and feed many products. I see no way to get the fiber cable all the way into this closet, can the fiber be hooked into the 6/u cable and fed into the junction box where the fiber equipment can then be located. I can get no answers on this, even asked the fiber installer this morning. Since I'm on the 50mps now I'm sure the 300 plan will work fine as I don't want cable run issues and product capability issues. Thanks