Joe Rossignol speaking for MacRumors,

Toyota and Lexus plan to expand CarPlay compatibility to other 2019 model year and beyond vehicles with its Entune 3.0 and Enform 2.0 multimedia systems respectively, according to company spokesperson Brian Lyons. Toyota and Lexus vehicles with CarPlay will initially be sold in the United States only.

Finally. I bought a Lexus in January of 2016, very reluctantly because of the lack of CarPlay. Never again. I never use the car navigation, instead mounting my iPhone on the dash. I assume it is technologically impossible to retrofit the old system to be CarPlay compatible.