Just for fun, a few weeks ago I made this post:
So updating it, what we got was:
Synthetic Dawn:
Synthetic Dawn announcement: 2017-08-03 [0].
Synthetic Dawn release date reveal: 2017-09-06 [+5 weeks].
Synthetic Dawn release: 2017-09-21 [+7 weeks].
Review: The release date reveal was later than predicted, but the actual release date fell nicely within the predicted timeframe.
Going by the current pattern of announcement/release date reveal/actual release:
Leviathans:
Leviathans announcement: 2016-09-15 [0].
Leviathans release date reveal: 2016-10-10 [+3.5 weeks].
Leviathans release: 2016-10-20 [+5 weeks].
Utopia:
Utopia announcement: 2017-02-02 [0].
Utopia release date reveal: 2017-02-27 [+3.5 weeks].
Utopia release date: 2017-04-06 [+10 weeks].
Synthetic Dawn:
Synthetic Dawn announcement: 2017-08-03 [0].
Synthetic Dawn release date reveal: Unknown [+3.5 weeks = August 28th, 2017].
Synthetic Dawn release: Unknown [+5~10 weeks = September 7th till October 5th, 2017].
The assumption here is that these three-step announcements are a reflection of Paradox's internal milestones. So if we do not get a release date reveal around August 28th, we can assume development on Synthetic Dawn is going slower than on Leviathans/Utopia and actual release will be further away. (Obv. it can also be that Paradox's announcement policy has changed since Utopia, but in that case all bets are off anyways.)
So updating it, what we got was:
Synthetic Dawn:
Synthetic Dawn announcement: 2017-08-03 [0].
Synthetic Dawn release date reveal: 2017-09-06 [+5 weeks].
Synthetic Dawn release: 2017-09-21 [+7 weeks].
Review: The release date reveal was later than predicted, but the actual release date fell nicely within the predicted timeframe.