Comment 2 for bug 822298

Please note that property (SignalsLocation) and parameter in Enable method have been anticipated in the API:
As here http://projects.gnome.org/NetworkManager/developers/mm-spec-04.html :
Parameter:
 "SignalsLocation - b - (read) -- TRUE if location updates will be emitted via D-Bus signals,"
Metod Enable:
" signal_location - b -- When enabling location information gathering, this argument controls whether the device emits signals with new location information or not. When signals are emitted, any client application (including malicious ones!) can listen for location updates unless D-Bus permissions restrict these signals from certain users. (...)"

Probably the signal has not been provided yet for security reasons.