Apple is all set to preview iPhone OS 4.0 at a media event in its headquarters, the Infinite Loop campus in Cupertino. Apple invited selected audience and the tag line of event is "Get sneak peek into the future of iPhone OS". Main attraction of the event is iPhone OS 4.0, the speculation about the exact nature of this new firmware will be over very soon. The chances are good that this will be only the release of the iPhone OS version 4.0, so no new Mac Book, Mac Mini ...