My thoughts, over at PJMedia.
I should note that I since I wrote it yesterday, I’m starting to think that perhaps a chunk of nylon at cold temperatures aloft broke off and blocked the nozzle, because I’m hearing that the oxidizer tank itself was intact, meaning that it was a combustion-chamber explosion (which would be consistent with the pictures). So perhaps it was a problem with the new fuel. Either way, we won’t know until the NTSB completes its investigation, but either way, I think they have to (finally) take a new approach.
[Evening update]
This article at The Telegraph is pretty devastating.
I think that the biggest issue at this point is how to stave off demands that the FAA start regulating, and to somehow still extend the learning period.