And several of those Google produced articles don't say that there will be a 2017 Bronco just that the "release date is coming." One of the articles had a big headline of 2017 Ford Bronco. Then right below that was a smaller headline "Confirmed: 2020 Ford Bronco." I think these articles saying that there will be a 2017 Bronco are either wishful thinking or a total misunderstanding of what Ford (and the union officer) said.
I may be wrong, but 2017 model introductions are upon us, and will begin any day now. I can't imagine that Ford would release a vehicle this month or next while still using future tense--a la "will" be built in Michigan--about construction. Besides if they had been working on design, construction specs, etc for a 2017 release date, I doubt that they could have kept it a secret up until now or would have wanted to keep it a secret.