This could be interesting.

Per The Unofficial Apple Weblog, a Twitter post from user @chenks shows the hidden metadata of an iPhone OS 4.0 screenshot states that the picture came from the phone’s “Back Camera.”

The image brings up a stronger possibility that the upcoming iPhone could feature a front-facing camera as well as the conventional back-facing camera.

If so, applications such as Skype, iChat and others could come into their own via video conferencing on the iPhone.

Stay tuned for additional details as we get them.