Yesterday Apple released iOS 5 Beta which brings alot of new features to iOS devices including revamped notification system and iMessage messenger. Apple also pushed out a beta version of iTunes 10.3 to brings iCloud related features to iOS 5. All those users with Jailbroken iPhone, iPod touch and iPad should update iTunes to 10.3. It is safe for all Jailbreak and unlock devices.
Now @DinoD7 (Entrepreneur in Jailbreak iOS devices) has confirmed that iTunes 10.3 is safe for all Jailbreak iOS devices