I think GTA

S3 will be of similar size to San An... but they will increase Res, Polygons, Draw Distance, Peds/Cars visible and effects...
To all those Online haters for GTA out there... Did anyone play GTA1 across a LAN?
I played it across a LAN with 3 PC's... and it was awesome... Basically it's just like a deathmatch... but with GTA rules... to date it's been one of my favourite network/online experiences...
Now with a city the size of SA... you'd need at least 32 people... and they'd all be on your radar... and of course you could then join/create gangs... go on hunts and kill loads of people together... go and steal the tank.... the hunter... do drive-bys... the possibilities are endless... but trying to pin a storyline to multiplayer GTA online just won't be possible I think... unless they turn it into a MMORPG... and not a lot of people have the time/money or inclination to play them...
So GTA

S3 will have a big city that looks better... a new city... a new storyline... but it will have online components that you will be able to play as standalone sessions that don't link to the story. Online type battles could take place in various forms...
Territory battles... (Each gang starts in a certain territory and they have to hold/take over more by killing gang members... taking out hideouts... claiming turf... Protecting leader... protecting turf etc...
Deathmatch... all vs all... kill as many times as you can before you die/get busted 10 times.
Killing Spree... Cause as much mayhem as you can in the city before you die/get busted 10 times. (Winner is the one with the most destruction/cops killed/players killed etc)
Car Thief... Steal a list of cars and deliver them to your garage... each player/team has a list and a garage and the first to complete it wins... (Look out for people stealing your cars out of your garage though?!)
Cops Vs Robbers... two teams... one are crims... one are cops... Criminals cause havoc... Cops get reports of havoc being caused and Crims with wanted stars appear on radar... or Crims spoted by other cops too... Each cop has ten lives... each crim can die or get busted ten times... last team standing... Cops would always restart in HQ... but would be able to tool up their weapons/cars.
Can you see the possibilities yet?
I can see it being awesome... altho I'll probs never own a PS3... and/or a decent broadband pipe to play it on... it would be amazing though...
C.