There's really not a whole lot of new features to discuss regarding the new iTunes 10.6.3. There isn't new "in the Cloud" support because that was already established in 10.3.1. There aren't a bunch of new features or a new interface or anything like that, actually. There is, however, a new degree of compatibility built in, targeting use in the iOS 6 environment. While the OS is still in its Beta stage, those who are wondering how Apple's entertainment content acquisition software will work with the new OS, now's your chance to find out.
Over at Twitter, there seems to be a little bit of a pushback against the iTunes updates, at least for some:
Dear iTunes, I don't care for your constant useless updates. Leave me alone.
Dear iTunes i don't want to update to version 10.6.38743928502
This itunes update is taking forever
so I update my itunes and its exactly the same