This is an interesting announcement, in the context of Elon’s Mars speech next week in Guadalajara:
At this stage of the investigation, preliminary review of the data and debris suggests that a large breach in the cryogenic helium system of the second stage liquid oxygen tank took place. All plausible causes are being tracked in an extensive fault tree and carefully investigated. Through the fault tree and data review process, we have exonerated any connection with last year’s CRS-7 mishap.
Makes sense, but still doesn’t sound like they’ve gotten to the root cause.