The December 2016 ArcGIS Online update included new functionality and some enhancements to existing functionality. Some of the new aspects were suggested and supported by users at ArcGIS Ideas. Here is a list of the ideas that were implemented and partially implemented at this release.
13. Edit and Query Related Records in an AGO webmap, Web AppBuilder, and other web app templates (Partially Implemented)
Thanks for all of the comments, votes and Ideas!