More accurate publishing. Now requires that $base_url be set in your settings.php file. This is much easier to control from an end user perspective and should resolve most issues people were having. This has been shown to work in the wild and in elms so marking this beta
hook_theme_registry_alter and hook_preprocess_page used to apply a custom class to the body related to each region available. Themes and other modules can then target this class to perform certain css alterations based on the existence of a region. This way the layout can be modified for some users that can view a region and not for others (for example).
Organic groups user roles is no longer required in order to use the role mapping capabilities. Very useful in putting users in groups yet setting their role globally.
This has been used in production for several months without additional API changes being needed. Pushing minor changes that were in the dev beyond the alpha release
Minor code restructuring. Some more flexibility in ability to return definitions of node references. API itself has remained in tact long enough to justify a move to beta