An analysis by Pirelli has confirmed that Sebastian Vettel’s right rear tyre did not suffer any kind of structural failure – and the Italian company has not ruled out debris some kind of “outside circumstances” as the cause.
A Pirelli statement today said:
“Following an extensive investigation of the circumstances that led to Sebastian Vettel’s right-rear tyre suddenly deflating on the opening lap of the Abu Dhabi Grand Prix, a structural failure of the tyre has been ruled out as the cause by Pirelli’s engineers.
“Although not much remained of the tyre afterwards, there was enough for Pirelli’s engineers to carry out a full investigation, in collaboration with Red Bull Racing. Having subjected the tyre to minute analysis, structural failure of the tyre or valve has been ruled out as a cause of the incident. Track debris or other outside circumstances cannot be excluded as a possible cause.”
Adam Cooper F1 
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If it had anything to do with the set up of the car Red Bull will probably allow this failure to remain a mystery. My guess is low tyre pressure.
Given what happened in Spa that wouldn’t surprise me at all.