GTA V hits PS4 and Xbox One on November 18, 2014, and PC on January 27, 2015.
Danish retailer Coolshop put up a listing for the PC version of GTA V with an expected release date of November 14, 2014. That date has since been changed in their listing to the placeholder December 31st, but on the internet mistakes are forever. Keep in mind, if it is a real release date, it would be a European release date and not for North America.
It's the Grand Theft Auto V Independence Day Special, and it's chock-full of 'Murican goodies fit for celebrating the best damn holiday of the year. Goodies like:
Firework rocket launchers.
Grills that give off red, white, and blue stars.
And motorcycles. Lots and lots of motorcycles.
The content pack will be available to purchase through mid-July.