I doubt it. Even if returns suddenly skyrocketed after the PR damage control event people would have already bought something else along with a 2 year contract

I doubt it. Even if returns suddenly skyrocketed after the PR damage control event people would have already bought something else along with a 2 year contract that prevents them from buying an iPhone 5 in the next 12-18 months for anything less than $400-$500. There would be no good reason to move up the date for the iPhone 5. At worst maybe a Rev B model could appear but that would be an industrial design project. I don't think it would tax OSX developers or be a major distraction.