CVG has also posted an hour-long video preview of the game:
In case this is all too much for you, here are the highlights from the previews:
There will be five times as many pedestrians as in GTA IV.
You're given a smartphone - the iFruit - that allows you take photos in-game and post them online to Social Club or your own social network profile. There are a total of nine apps on the phone: "camera, internet, contacts, social media, a calendar, and an option to go back and replay individual missions."
Combat mechanics have improved, and it's easier to get in and out of cover.
Pay N Spray is also a mod shop: "your cars can be given paint jobs, new wheels, window tints, grilles, spoilers, plus you can upgrade suspensions, engine and brakes".
You can customize weapons: "adding laser sights, scopes, silencers, and high capacity magazines".
You can give your characters haircuts, new clothes, and tattoos.
You can pick up hitchhikers, do stunt/flying challenges, practice yoga, play golf and tennis, race bikes, and buy real estate.
The game opens with Franklin parachuting into the wilderness to meet Trevor.
Trevor's first mission has him waking up next to a few dead bodies of members from the biker gang The Lost. Trevor climbs aboard a boat, goes out to sea, and then dives in with scuba gear to inspect a wrecked ship.
One of Michael's side missions has you playing chauffeur for an actress, trying to avoid the paparazzi following you for a photo.
"Blitz Play" is a mission that brings the three characters together for the first time, in a Heat-style heist at a jewelry store. During this mission, you can switch between characters to accomplish separate parts of the heist.
Each character is rated on the following abilities: Special, Stamina, Shooting, Strength, Stealth, Flying, Driving, Mechanic, Lung Capacity.
Special ability: Franklin can slow down time while driving.
Special ability: Trevor can do double damage while only taking half.
Special ability: Michael can enable bullet time.
Characters can increase their abilities by completing missions.
Switching between characters is visually like Google Earth - the camera zooms out on the world, goes static, and then zooms in on your newly chosen character.
Your multiplayer avatar will be available at the character switching area.
"Glamorous" by Fergie (ft. Ludacris) was heard during a mission.
"I Like It" by Enrique Iglesias was heard in another preview.
"Regulate" by Warren G (ft. Nate Dogg) was heard on a classic hip hop station in game.