+ Removed a bullet that read;
We do not associate any of the information that Toolbar sends with other personal information about you. However, it is possible that a URL or other page information sent to Google may itself contain personal information. For information about how some web sites embed personal information in web requests, click here.
+ Added/Changed Significantly the following bullets;
(3) If you have Google Toolbar Version 4.0 or above, your copy of Google Toolbar includes a unique application number. When you install Google Toolbar, this number and a message indicating whether the installation succeeded are sent back to Google. Also, when Google Toolbar automatically checks to see if a new version is available, the current version number and the unique application number are sent to Google. The unique application number is required for Google Toolbar to work and cannot be disabled.
(4) Except for information sent through Toolbar for use with a separate Account-based service such as Gmail, we do not associate any of the information that Toolbar sends with other personal information about you. However, it is possible that a URL or other page information sent to Google may itself contain personal information. For information about how this may happen, click here.
Those are the changes I noticed.