I'm guessing they'll in all reality stop orders on 2020's at some point, and then look to take orders for 2021's. So as jw_tx21 says above, any cars ordered now will be 2020's for sure unless the dealer says they ordered it but really didn't. I would wonder if the manufacturer would give them a heads up saying to take no more new 2020 orders after X date. I would bet many dealers that folks have put money down for their cars from have more on the "list" to be ordered than actually will get allocations for 2020's, but hey I could be wrong and I'm no expert with any sort of knowledge other than what I read on here.
I am also somewhat confused if Kia had any insight into how this was going to go and what their plans are to remedy this production issue. Reason I say that is manufacturers like Chevy are already saying... we have X capacity for Corvette's in a year, and are saying they aren't taking anymore orders at this point. They know what they can handle, and are being pretty clear about it. Kia on the other hand, I'm not sure many folks know including some of the insiders on here. If they aren't going to be able to make our cars within 4-6 months, just tell us. So if anyone from Kia is watching... what is your production capacity to make these in a year, and can you fill all these open yet technically unaccepted orders in the 2020 model year? We know the reports of 340k cars produced a year in that plant, but that is likely shared w/ the Sorento and Optima as well.
Initially they said they'd build 40k during calendar year 2020. VINs are around 65k, so they definitely increased production in response to demand. If the order queue becomes too long for fulfillment, they will stop taking orders. They did this once already when they stopped taking SX-P orders from mid-May to late July. They are watching and they understand their queue.