The ultrathin ZenBook S UX391 is already available in its new coat of paint for $1200 USD. Otherwise, there are no other internal changes or any additional colors planned at the moment.
https://www.notebookcheck.net/Asus-ZenBook-S-gets-new-Burgandy-Red-color-option.332720.0.html
The red model comes with just 8GB of RAM and 256GB SSD compared to 16GB RAM and 512GB SSD on the blue model which retails for 1499