said by BSD24 :

wifi - the technicians (for both companies) should keep everything seperate.

said by BSD24 :

Well it depends on what you already have and what your using, basicly how your setup is. If you already have an existing line in the room, but you also have a TV for cable inthere, then Fios will run a seperate line up to the room (assuming they use coax for it instead of Cat5e(network cable)). For your internet.

If you have an existing outlet but not using it for cable tv, and its hooked up to cable. Fios will most likely disconnect that cable from the cable service (splitter) that comes into your house and connect it to their Fios system.

If you have 2 coax outlets existing, and one is in use and the other one is not but both are connected to cable tv service. Then Fios will most likely disconnect the cable line your not using and hook it up to their Fios system.

Just wanted to kind of give you some examples. This is why it really depends on what is already setup in your house. Also depending on what the techs find, if a line even if not in use is not good quality for the service for one reason or another may opt to run a new line anyways. But Fios service lines shouldn't connect into the Cable service lines. Both use a "Closed" cable system to prevent signal loss (egress or ingress) or foreign-signal interference.