Media, after first spreading unsubstantiated rumours about explosions, now seem to be speculating about pilot error. Methinks this is one of many possibilities, and it can not be ruled out, yet its a premature to jump to conclusions. The NTSB will be more responsible.
Unsurprisingly, it seems someone already pointed out the feathering system as a potential complication in this 4 year old article (it's somewhat "colorful"):
"the feathered reentry system is another mechanical system that must absolutely work well for a safe return of the craft, but like all kind of mechanical system can have some malfunctions"
::: Why the suborbital space tourism is TOO DANGEROUS :::
Some previously brought up the question of certification in this thread. I really do wonder according to what ruleset this is going to be certified for commercial passenger transport, and what the risk analysis will look like, but there doesn't seem to be too much information about that? Nevertheless, its commendable that scaled and vg didnt aggressively push their initital schedule.