IGN's posted the first Street Fighter IV review. It's a whopping 9.3/10.
Street Fighter IV is a fantastic game overall and Capcom should be commended for designing a game that can work on so many levels by appealing to both casual and hardcore players. I'll admit that when I first heard I was reviewing Street Fighter IV, I wasn't terribly excited. I suppose I just didn't think much of it. But as I played and experimented with each character, fighting a variety of the IGN folks and learning something new with every match, I realized just how irrevocably deep fighting games -- and Street Fighter games in particular -- really are. I encourage everyone to give Street Fighter IV a try, even if you're relatively new to the fighting game scene. There's so much depth to the gameplay that you'll be rewarded long after your purchase.
Video review after the break. Game's out February 20.