As quoted from the Silicon Alley Insider (SAI), this Facebook feature will be announced at the Apple Worldwide Developers Conference keynote, which will be held June 7 next.
SAI sources said that Apple would at least establish synchronization Facebook contacts into the iPhone software. Thus, iPhone users can pull contacts from Facebook, the iPhone address list.
In addition, Apple also may be integrating Facebook Connect directly into Apple's software developers kit, so that the programmer can directly add to Facebook features into their applications.
According to Facebook, approximately 34.2 million people are active Facebook users through the iPhone application. The figure is roughly equivalent to 10 percent from 400 million users of Facebook. Apple iTunes also has long been an advertiser on Facebook.