6. There may be tiny differences between the Xbox 360 and PS3 version but Rockstar is aiming to make both versions very similar - no PS3 Sixaxis support.
Not much more to say on this. As you probably know, the Xbox 360 version will have access to exclusive episodic content, which, in my mind, makes the 360 version the one to get. We've also heard rumblings that the release date of the game has been held back because of PS3 development issues. When I asked if there will be any differences Rockstar said that apart from the episodic content the team is aiming to make both versions very similar. But it did admit that there may be tiny differences. No Sixaxis support either, which may be a blessing in disguise for PS3 owners.
5. It's unlikely there will be a GTA 4 demo.
When I asked Rockstar about this, this was its response: "I'm sure there won't be. If there was we would have talked about it. With a game like this the guys at Rockstar North will want to spend every minute making the game look great. Most people know the concept of GTA anyway. I don't know that the demo is worth the time and effort.
"Also much of GTA 4 is the driving around and we wouldn't be able to give out the whole city. We would have to give away half the game for free. People would think Liberty City is a tiny city. You run into problems." So there it is. No GTA 4 demo. Get over it.