I have FiOS as well, for question 1 it depends on the package you get for most non HUGE cities the packages should be 5/2 (40$), 15/2(50$) 30/10(i think its 130 or 160; but in my friends area when it started it was only 80$)
1)you will notice better ping times if your down/upspeed will be greater than what you have now, of course your upspeed will problaly be higher since DSL/Cable have sucy upload speeds.
2)This question troubled me as well, but i tihnk they are basically going to do a network set-up/wireless setup. In my house i have a room in the master bedroom that has all of the houses Coax/Cat5-e cobles routed to there, They ran the fiber right into my room, but the router is in the closet so i can just hook it up easily. MAybe what they are referring to is Running the fiber itself to two computers,needless to say just ask for ne room they will give you an Actiontec Wireless router for free, so you can just run Cat-5 or use wireless for oyur other pc's
As for the person that said you can never remove it from your house, i don't know who told you that but i can cancel the service if i want after 1 year or before your second month starts. As in never remove it from your homeI think you are refering to the actual fiber not the service, SINCE THEY WILL RUN FIBER INTO YOUR HOUSE FOR OPTIMUM PERFORMANCE.
Also so you know they will be installing some equipment either inside or outside of your house. I told them to do it inside siince i didnt want them to ruin my new house. It will be a Backup battery for the FiOS in case the power goes out and you need to male a CALL, and two other boxes, i dunno what they are for but the just have the cables inside of them. i PAY FOR fIOS,INTERNET, AND FiOS PHONE.