I suspect run-of-the-mill corporate merger/buyout administrative stuff. Lucasfilm had a different Privacy Policy and Terms of Use than Disney. Disney is changing them to be compatible with the existing Disney ones. Apparently Lucasfilm's Privacy Policy and Terms of Use did not come with a "subject to change without notice" clause, or nobody would have seen these notifications and the policy change would have happened anyway.

Not that this means that the contents of Disney's Privacy Policies and Terms of Use are necessarily unremarkable, just that a change like this after a buyout is.