I remember the Youtube channel Autoline Daily had mentioned that an online viewer/subscriber had come across a caravan of Kia Sorento SUVS that did not have a fuel tank lid and was able to see a blue DEF fluid cap right next to fuel cap and wondered what it meant. I guess NOW we know.
https://blog.caranddriver.com/updated-2019-kia-sorento-loses-turbocharged-engine-diesel-coming-soon/
https://blog.caranddriver.com/updated-2019-kia-sorento-loses-turbocharged-engine-diesel-coming-soon/