Rockstar Games has detailed some of the exclusive content that is coming to Grand Theft Auto V for the Xbox One, PlayStation 4, and PC. This new content is a mix of fresh activities, new vehicles, and new weapons.
New Events & RewardsMurder Mystery
As Michael, follow a trail of cryptic clues to unravel a grisly murder mystery. Put the clues together and you'll unlock two Noir Style Filters, which will give your Story Mode gameplay and Snapmatic photos the feel of a gritty old school crime classic.

Weapons: The Rail Gun & Hatchet
Obliterate your adversaries with the high-powered, high-velocity Rail Gun. This piece of experimental military technology also has its own set of Shooting Range Challenges at your local Ammu-Nation shooting range. Or hack and slash foes up close and personal with the brutal Hatchet melee weapon.

Wildlife Photography Challenge
There are new species of animals across Los Santos and Blaine County, and the LS Tourist Board needs someone to document them. As Franklin, catalog unique animal species scattered across the map to unlock the special Kraken Sub.

Stock Car Races
Win a series of new Stock Car Races to earn unique custom Muscle Cars adorned with logos from some of the companies that made this country great.

Monkey Mosaics
A mysterious street artist is tagging walls all across town with his simian-inspired silhouettes. Track down and photograph them all to earn new monkey outfits (available to all players) and a special Go Go Monkey Blista exclusively for returning players.

New Vehicles and More

Rockstar also mentions that if you had exclusive content on the previous generation you will still have access to that on the current gen versions of the game. This includes but is not limited to weapons, clothes, and other perks if you had the CE or SE versions of the game.