This can't come soon enough. XCode 4 is nice but nothing comes close to IntelliJ. (Note this image was taken over 10 months ago.)
More info : http://www.jetbrains.com/cidr/
Some iPhone/Mac devs are obsessive about their UI. This does not look like their kind of app.
It looks extremely cramped because it had to fit on a slide-show. And IDEs usually look complex. Here's a larger screenshot of WebStorm which uses the newer IntelliJ 10 look and feel http://www.jetbrains.com/webstorm/img/WS_mac.png