Some confusion on here regarding a possible delay to the MBP 16: Just want to highlight the last paragraph of the
9-5 Mac article which cites Kuo:
"Typically, Kuo refers to devices precisely, so information on MacBook Pro would state ‘MacBook Pro’. Therefore, we think it is likely that today’s mention refers to a different Apple laptop line."
So the information given by Kuo is *likely* about the Macbook line in general, which of course Kuo himself wouldn't know exactly which models get a refresh when, but that the rest of the line will be refreshed in 2020.
I would guess that they will announce the 16 MBP in October, for the simple reason that if they don't, the next window is at WWDC 2019, which is a long 8 months from now. In this case, if you combine with Kuo's information, that would mean Apple is refreshing their entire Macbook line in 1 go, which contrasts to how they typically roll out products, leading with a single new product and updating the rest of the line soon after.
The other option is to refresh sometime early 2020, but I don't think Apple has ever announced novel Mac hardware in those periods (probably because sales are slow in that time anyway). Someone can correct me if i'm wrong though!