Apple has pushed an update to iTunes, 10.2.1, ahead of iOS 4.3 release. Most likely, the update carries just minor bug fixes and performance improvement patches. Go and get it! We recommend you to take a backup before installation to avoid possible loss of data in the library.
Last week only, Apple released iTunes 10.2 which enabled iOS 4.3 syncing and improved Home Sharing. We will update you once we receive more information about it.