Met a person at Duiker, he was native and told me little about their history and regional languages:
Languages of Lower, Central and Upper Hunza
Lower Hunza: Shina language spoken in Gilgit to Aliabad
Central Hunza: Burushaski, Its spoken in Nagar, Hunza/Aliabad
Upper Hunza: Wakhi, It is spoken by the majority of people in Gojal Tehsil of Hunza ~ Wakhi from Wakhan areas (like Wakhan Corridor)