Having spent some time reviewing Rockstar's teaser trailer for Grand Theft Auto IV just to eek out some extra details from the minute long reveal several weeks ago, attention has now turned to analysing additional details about the game itself.

Reports from the US emerged first, confirming the identity of GTA IV's protagonist, the single-city location, and the game's lack of aeroplanes, but now it's the turn of UK-based publications in this instance, PSM UK. In the latest issue, the publication reveals further titbits of information including news that the masses of NPCs that wander around the streets of Liberty City have their own quirks (for instance, some will smoke), and that the police force will be more challenging this time around.

There certainly seems to be plenty of little details being thrown into the fourth true iteration of the ten-year old franchise, including a wide variety of behaviours from NPCs, and several unconfirmed multiplayer modes, but the article also reveals one of two interesting notions. First of all is the apparent restraint being placed on Rockstar North thanks to Microsoft's decision to release the harddrive-less Core version of Xbox 360, something that the Oblivion team at Bethesda Softworks can no doubt relate to. The Xbox 360's DVD player is also cited as something of a restraint in the article too.

Secondly, there certainly seems to be quite a lot of 'little' details being bandied about several months before launch - so what is Rockstar holding back?