The future product will be a small expansion PCB, loaded with connectors and packaged with a bunch of cables. It will sell as a package, and you will simply plug cables together to hook it all up. There will be no need for the casual user to know the schematic in order to make the connection.
The DOW, GND and +5v are all brought out on the CFA-631's existing back connector. The expansion board adds a pull-up to DOW (for sensor strings longer than 8) and a current limiting resistor to the +5v (to protect in case of shorts).