IGN have posted a new feature titled 'Grand Theft Auto IV: A New Breed of Action'. The article looks at combat in GTA IV, and is based on the 90-minute preview session they were given by Rockstar two weeks ago. There doesn't appear to be any [obvious] new info in it, but it's probably worth a read nevertheless.
"What we've seen happen over the last couple of years is that a new standard for combat mechanics has emerged for third person videogames, regardless of genre. Whether it's an action adventure game like Uncharted: Drake's Fortune, a straight-up shooter like Gears of War or an open-world title like GTA IV, certain things are expected – smooth, accurate control for targeting, intuitive cover mechanics and non-restrictive agility. GTA IV checks off all those boxes, and while going hands-on will be the most important test, it's clear from our latest – extensive – eyes on, that Rockstar North is on the right track."
Link: IGN: A New Breed of Action