What we don't know is whether the new OS build includes a fix for another passcode flaw seen on a video produced by Vulnerability Labs. The video shows how the passcode lock can be disabled by dialing and then cancelling an emergency call while playing with the power button. The combination allows someone to gain access to your phone and view your photos and contacts list. The person could even load them on to a PC using a USB cord, while bypassing your passcode protection.
Since the second flaw is connected to the first, it is hoped that iOS 6.1.3 will be able to close both openings at once. Apple has acknowledged the flaws but has not mentioned a timeframe for the release of the next update.