This is a welcome change, one many users have been asking for a long time.
The default positioning setting is now Auto - Origin to Origin, pause for the sound of applause (and comments like "finally") in offices around the globe...
If you change the default setting, the option you select for Positioning becomes the default instead for your current Revit session. Revit will also remember a different setting for Revit models and CAD files. For example, this will make it easier to use Auto-Origin to Origin for Revit models and Auto - Center to Center for CAD files.
Glad to see this subtle but heavily wished for change.