Shamelessly taken from GTAForums
Answers:
-They played it on Xbox 360
-They played for about 4-5 hours
-Each street feels unique
-No load times
-Almost no diffrence between PS3 and Xbox 360 performance
-No demo before release
-Tiny pop-ups in the distance
-Talking about the features from other games MP3, Midnight Club, RDR
-Improved shooting mechanics
-Cannot play campaign in co-op
-No filling up cars with petrol
-Talking about how there are missions online
-70 Missions in GTA 4--------------------------------------------------------------NOT GTA 5!!!
-How its all keeping "you" in the action
-Stealth plays a big part in weapons
-They used a "Friend Tracker" on thier phone in the mission "Fresh Meat"
-Fog blocks really far view
-They didn't go under water
- Lez Benzies says under-water plays a big part
-There are alot to do in-between missions
-They saw the map
-Cross winds affect parachuting
-Dogs are online
-Not sure about "Vigilante" missions
-No hidden packages
-They heard of a radio broadcast of an "homocide being re-investigated - You can then go and solve that case!
-Cannot confirm custom soundtracks
-About 17 radio stations, 240 songs, 15 music stations, 2 talk stations, 20 hours of score
- radio wheel like weapon wheel
-Can hold down right on the d-pad to turn on headlights
-They played a debug version
-Awesome military bases, Very armed
-The characters have more "fluidity" and "solidity"
-The characters feel different to control
-They have very different "social circles"
-They said no old characters returning?
-The character switching is easy "hold down on the d-pad then use the analog to choose"
-A single story with "different perspectives"
-That silhouette at the bottom of the character wheel will feature your online charater
-Trevor doesn't appear right at the start
-Micheal gets held hostage
-"More guns in GTA5 than any other GTA game ever"
-They could only access certain missions
http://gtaforums.com/topic/583499-ign-gta-your-questions-answered/