Apple has updated the iTunes fixing bugs mainly. One of the main changes is that it disables “older versions of some incompatible third-party plug-ins.” apple is not saying which plugins they have disabled. This update is recommended for all users but then again if you are worried that this update may impact the upcoming jailbreak we suggest you stay away from the update and wait for official word from The Dev Team.

iTunes 9.2.1 provides a number of important bug fixes, including:

• Disables older versions of some incompatible third-party plug-ins
• Addresses minor issues with dragging and dropping items
• Addresses a performance issue when first syncing to some devices with iTunes 9.2
• Addresses an issue upgrading to iOS 4 on an iPhone or iPod touch with encrypted back-ups
• Addresses other issues that improve stability and performance

iTunes 9.2 comes with several new features and improvements, including:

• Sync with iPhone 4 to enjoy your favorite music, movies, TV shows, books and more on-the-go

• Sync and read books with iPhone or iPod touch with iOS 4 and iBooks 1.1

• Organize and sync PDF documents as books. Read PDFs with iBooks 1.1 on iPad and any iPhone or iPod touch with iOS 4

• Organize your apps on your iOS 4 home screens into folders using iTunes

• Faster back-ups while syncing an iPhone or iPod touch with iOS 4

• Album artwork improvements make artwork appear more quickly when exploring your library

For information on the security content of this update, please visit:http://support.apple.com/kb/HT1222