Any Lookup (List) or Lookup (Multiselect) gadget that points to another dataset (aka app) will now show those results in the dropdown alphabetically (currently it displayed in the order the document was created).  If you are using the default Form Title Field of Document ID for the linked app then you will see no change in behavior.  However, if you were pointing to a different field in the app for Form Title Field you will see that the documents are now ordered alphabetically.  This should allow users to find the desired document more easily in the dropdown to select in the form.

More information on this functionality can be found in the Advanced Lookup Gadgets, Data Sharing, and Form Title Field articles.