This is a bug fix release. The major problem it addresses is that sorting was broken in beta2. (#1888284: Sort showing, but not working)
NOTE: After this update, you may need to revert the view called "Node Gallery: Gallery Item Views" to repair issues related to sorting order. This can be done under Structure, Views. Expand the edit button and choose "revert". If you have intentionally customized this view, make sure the sort order includes Node Gallery weight.
Full list of fixes
#1888284: Sort showing, but not working
#1879092: Proper way of setting up a Multiselect Views filter
#1874348: Hardcoded localization of 's in "AUser's Galleries"
#1872808: Duplicate entry '1' in node_gallery_relationship_type upon upgrade
#1896530: Undefined index: label in field_ui_field_type_options() on "admin/structure/types/manage/xxxxxxxx/fields"
#1903642: scheme (private vs public) uses system default rather than field instance settings with plupload
#1901614: Undefined function node_gallery_api_batch_rotate() when bulk editing images
#1901610: Remove node_gallery_api_taxonomy_compare()
#1901730: Bulk edit of Taxonomy tags causes editing to fail