This release contains a number of bug fixes that had piled up since the last tagged release. Notably, it does change the API with respect to address field element rendering, with elements including #options lists no longer automatically expanding to the full name option value unless it sets its #render_option_value attribute to TRUE.
Some small new features have been added, including Devel Generate support, and the issue queue has generally been cleaned up with all remaining open bug reports representing actual bugs (and not simply country incompatibilities).
* #1972502 Supporting multilevel fieldgroups by @TimBrandin
* #1971780 Undefined index: FIELDNAME locale_field_node_form_submit() by @TimBrandin
* Example module for demonstration and test
* warning when submit button is not inside actions item in form array
* all notices and warnings when using with custom forms fixed. Also incorrect
sorting of custom forms page groups fixed
* #1971878 Undefined index #attributes in field_group_ajaxified_multipage_form_alter @Dustin Bons
* README updated for new hook