For anyone still looking to the FCPX summit for insight: Apparently there were NDA's required in advance to attend a portion or portions of the Apple Campus visit in anticipation of something "exciting" being discussed. They might just be related to upcoming software release(s).
There is speculation FMC just used that as a ploy to build hype for the event. It's a pretty small crowd (under 100) and small event compared to others in the industry (like Avid/ProTools or Adobe events). The conference is not even sold out. Tickets were still being sold as of this morning for today and tomorrow.
So they saw something I guess?
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I assuming that Mac Pro 2019 will release in Dec like they did with Mac Pro 2013.