I was prompted to update when starting up my desktop manager a bit ago, (For my PC) so I would imagine it to be the same for everyone.
If you are not prompted to update you can always check for the update by using the link below.
BlackBerry® Desktop Software 6.1 adds new features and important enhancements to media and synchronization:
• You can use the new Files feature to manage your files between your smartphone and computer.
• If encryption is turned on for your smartphone, you can also synchronize encrypted media files or copy encrypted files between your smartphone and computer.
• If your smartphone is associated with a BlackBerry® Enterprise Server, you can also synchronize security certificates.
More details at http://www.blackberry.com/desktop/docs/.