Most likely Google will subcontract the home installation work. The home installation work should be similar to what cable and telephone companies do now. Media converters are available to perform the same tasks as cable or DSL modems. For example:What each house or apartment unit will get, I should think, is some kind of router, with a single1000Base-LX (fiber) ethernet port connecting to the Internet via Google's fiber, and a WiFi access point, plus some standard ethernet ports, forming the private network inside the home.
A media converter is designed to convert data signals between 10/100/1000Base-T and 1000Base-LX Gigabit Ethernet.
They need routing to separate the private network inside the dwelling units from the public network at their end. It's not just a matter of media conversion.