Because of the changes in GD Rating System Pro 4.0, all addons had to be updated and tested to make sure that they work with a new plugin version, and all addons have received major number compatibility update today.
The changes related to the query system, JS and CSS loading, database updates, all that required to update all addons to make sure they all work fine. New addon versions require plugin version 4.0, and it is essential to update all addons along with the main plugin, or you may end up with broken ratings. Basically, there are no new features added in any of the plugins, but some plugins got a lot of updates and bug fixes (Multi Rating addon had several bugs fixed this time).
Normal development for all addons will continue after this update, and the most important changes are coming in User Reviews Addon and continued development for new Analytics addon.
To see the list of all the changes, please check out the changelogs for: Code Builder Addon, Comment Form Addon, GD Rating System Pro, Multi Ratings Addon, myCRED Integration Addon, myCRED Simple Integration Addon, Recipe Rich Snippet Addon, User Reviews Addon. If you find any issues, please, report them in the support forums for: Code Builder Addon, Comment Form Addon, GD Rating System Pro, Multi Ratings Addon, myCRED Integration Addon, myCRED Simple Integration Addon, Recipe Rich Snippet Addon, User Reviews Addon.