Are you sure that's the correct schematic for the current ComX.GPS as there are a few differences when I compare the board against the schematics and against the UBlox NEO8 pin assignments, which lead me to assume the PPS is actually connected.
I can see on the board that the Chip Connection 3 (PPS) connects into the R9 Resistor while its unconnected on your schematic. The R9 resistor is also 20 Ohm on the board and 10ohm on your schematic. and I am assuming by this that I could connect to the resistor to obtain a PPS signal.
There is also a second difference that I have seen on n the board the IPEX antenna is marked F1 (E1 on your schematic) and connected into the C7 capacitor which isn't in your schematic,