Rockstar is to release a new update for Grand Theft Auto Online next week, which will add luxury items including new sports cars, gold private jets, weapons, and clothes.
Part 1 of the Ill-Gotten Gains update will introduce the Buckingham Swift Deluxe gold helicopter, Buckingham Luxor Deluxe gold airplane, Pegassi Osiris gull-winged door car, Albany Virgo vintage-style cars, eight vehicle wraps from high-end Rockford Hills designers for the Enus Windsor, Combat PDW personal defence weapon, and "Hundreds of new clothing items and accessories are arriving to exclusive clothiers".
Prices for these items in-game have not yet been announced, but you'll likely need to break the bank. Hopefully it won't be long before Rockstar reveal details of the second update.