Among them are an "EcoBoost Perf" kit that presumably sports up the turbocharged four-cylinder version of the Mustang; a Performance package for the Mustang GT; hints at an SVT/Shelby model; and most of the available exterior color schemes.
Other details picked out from the screenshots include a unique body code for the 50th Anniversary GT, available cashmere and leather upholstery, and hints at some of the technology that will be available in the cabin.
For many more screenshots, head over to Mustang6G.