some additional comments to clarify the partially bogus course_id.

cms/djangoapps/contentstore/module_info_model.py

@@ -12,10 +12,12 @@ def get_module_info(store, location, rewrite_static_links=False):
 
     data = module.data
     if rewrite_static_links:
+        # we pass a partially bogus course_id as we don't have the RUN information passed yet
+        # through the CMS. Also the contentstore is also not RUN-aware at this point in time.
         data = replace_static_urls(
             module.data,
             None,
-            course_id=module.location.org + '/' + module.location.course + '/REPLACE_WITH_RUN_WHEN_IMPLEMENTED'
+            course_id=module.location.org + '/' + module.location.course + '/BOGUS_RUN_REPLACE_WHEN_AVAILABLE'
         )
 
     return {

cms/djangoapps/contentstore/views/preview.py

@@ -155,10 +155,12 @@ def load_preview_module(request, preview_id, descriptor):
             "xmodule_display.html",
         )
 
+    # we pass a partially bogus course_id as we don't have the RUN information passed yet
+    # through the CMS. Also the contentstore is also not RUN-aware at this point in time.
     module.get_html = replace_static_urls(
         module.get_html,
         getattr(module, 'data_dir', module.location.course),
-        course_id=module.location.org+'/'+module.location.course+'/REPLACE_WITH_RUN'
+        course_id=module.location.org+'/'+module.location.course+'/BOGUS_RUN_REPLACE_WHEN_AVAILABLE'
     )
 
     module.get_html = save_module(