I can't confirm whether the GPS will work on an acceptable level on the Wi-Fi model yet. I can confirm that i will work in the LTE model that is being developed.
If GPS is mission critical to you, to be on the safe side, you should probably wait for the confirmation of this matter before making a purchase.
We are offering the devices in indiegogo without GPS as a precaution measure. If the GPS works as intended in the Wi-Fi models, all buyers will get it for free.