I work for one of the other companies in Maun, and was in the air when the accident happened and the events following. This is the first fatal accident in several years here and has come as quite a shock.
The aircraft crashed very shortly after takeoff from one a strip at the northern edge of the Delta (about 25 mins from Maun in a Caravan). A fire destroyed most of the aircraft, only the tail remained intact. Whether the fire was post impact or started inflight is unknown. There were 10 pax and 1 (experienced) pilot onboard. Only 4 of the pax survived, some still in critical condition. The response from the different operators in the area, and from the BDF was quick. First people overhead within minutes, and medical crews there within an hour.
That's all the facts that are publicly known at the moment.
The most widely believed cause is an engine failure immediately after takeoff.