The always secretive Apple will go a long way trying to enforce their culture of keeping everyone quietly waiting, and that is something hard to accomplish because if I knew someone on the Apple design team I would bug them to death for a few details so it's safe to assume that some people do that and some employees do not resist.
But the truth is that sometimes those leaks create expectations that people enjoy (sometimes create disappointment) but that is the whole idea of giving something to the people that are waiting, to chat about.
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