It does indeed seem Kia has made some tweaks to the configurator since yesterday.
**Sunset Yellow has been removed.
Since Limited-Slip Differential (LSD) seems to be a heavily wanted option, here's a quick summary.
Base Stinger LSD Availability = No
Premium Stinger LSD Availability = No
GT Stinger LSD Availability = Yes, only on RWD
GT1 Stinger LSD Availability = No
GT2 Stinger LSD Availability = Yes, only on RWD
Summary for Color Combinations:
Base Exterior Colors = Snow White Pearl, Silky Silver, Aurora Black Pearl
Base Interior Colors = Black Leather
Premium Exterior Colors = Snow White Pearl, Micro Blue Pearl, Silky Silver, Aurora Black Pearl
Premium Interior Colors = Black Leather, Light Gray Leather only with Snow White Pearl, Beige Leather only with Black
GT Exterior Colors = Snow White Pearl, HiChrome Red, Micro Blue Pearl, Silky Silver, Panthera Metal, Aurora Black Pearl
GT Interior Colors = Black Leather
GT1 Exterior Colors = Snow White Pearl, HiChrome Red, Micro Blue Pearl, Silky Silver, Panthera Metal, Ceramic Silver, Aurora Black Pearl
GT1 Interior Colors = Black Leather, Red Leather only with Silky Silver and Aurora Black Pearl
GT2 Exterior Colors = Snow White Pearl, HiChrome Red, Micro Blue Pearl, Silky Silver, Ceramic Silver, Aurora Black Pearl
GT2 Interior Colors = Black Leather only with Snow White Pearl and HiChrome Red, Red Leather only with Silky Silver; Ceramic Silver and Aurora Black Pearl, Light Gray Leather only with Micro Blue Pearl