I’ve been watching the thread on the SA forum, AVCOM, where it was first reported. Speculation makes it appear it could have been an engine failure and spin, as pics of the prop show little damage. The terrain suggests a successful landing without power was do able, especially with the level of experience of the pilots on board. The plane itself was originally flown around the world and was equipped with a chute, it’s unknown if it was still so equipped. The aircraft had some sort of engine issue going back a few weeks ago, when a Youtube celebrity used the Sling for a trip around Africa. It didn’t surface again after being checked and the flight went on. The pilots who perished, also had a problem prior to the crash, which had them divert from following the Teen pilots aircraft, who they were supporting. We also don’t know what the weather conditions were.
As is typical, too many unanswered questions. That’s what investigations are for and hopefully sometime in the future those questions will bring answers, so the families can have closure and any airworthiness issue for the type or engine can be addressed for existing aircraft.