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Good question, particularly in light of the fact that the Arabic version was posted only last week, right before the 9/11 assassination of Ambassador Stevens.
The trailer posted in July appears to have attracted little notice. But last week, a second version of the trailer was posted this time in Arabic.
http://articles.latimes.com/2012/sep/12/world/la-fg-libya-filmmaker-20120913
I am not sure about it being a set up for rioting. The Muslims use any reason for rioting. They don’t need to spend time of money to justify killings. But I might be wrong.