More information showing up today, this time from GTA-Xtreme:
* Graphicaly, GTA IV looks like Call of Duty 4, that's a good point.
* Niko have 2 things in his mind, getting money, and revenge.
* Creation of PC version could be possible with the 360 version.
* Damage are awesomely made.
* Roman's car is a little slow but you will have to learn to control it.
* GTA IV is very realistic. At a moment, Niko tryied to steal a car, and by mistake, while going with it, the player pressed the fire button and the gun shoot made a very loud noise. At the next intersection, cops turned their head toward Niko, and the passenger who was next to Niko put his hands up, his eyes moved aside because he was frightened saying "Son, you don't want to do this huh ?".
* At the beggining Niko sleeps on Roman's sofa but after he will be able to buy a house, but no building, or entreprise like in Vice city.
* When your wanted level will be too high, Tank will chase you.
Source: GTA-Xtreme
So now we now there are Tanks, but why did one of the previews yesterday say there wasn't any? Maybe the same goes for car customization?
*Merge*: I decided to hide the 2nd part, just in case. That Special Someone is probably revealed there.