CEO Tim Cook is expected to unveil the iPhone 5. Sources close to the situation say Cook will be the main presenter at the event, with execs Phil Schiller, Scott Forstall and Eddy Cue playing supporting roles. This would mark the first time that Cook has actually led an Apple event, adding an extra wrinkle of significance to an already highly anticipated occasion. The site's sources went on to say that the next-gen iPhone will be available for purchase "within a few weeks" of the announcement, though All Things Digital acknowledges that the exact date of its unveiling is still subject to change. As always, we'll be sure to keep you posted as soon as we hear more.