There’s support for the sensors in the Kit Create software, but I haven’t found any GPS stuff in there yet.
I did test the GPS I bought with the gps test sketch and it was getting information (I didn’t verify the accuracy, the first tests were merely connection and basic reading), so I’m pretty sure the one I got is functional, but yeah, nothing shows up in the Kit Create.
I’ve looked at modifying the sensors.* source code to add gps versions, but I don’t have anything close to working yet. I have expanded the Kit to 2 home screens and added to the new 2nd screen a “GPS” window, but it’s unpopulated still. I’m sure that’s what has to happen, but my experience with IIC devices is limited to what I’ve looked at in the sensors.* stuff, so it’ll be slow going.