CKEditor plugins registered by hook does not include "media" module

Using 7.x-2.0-alpha3+114-dev and ckeditor 7.x-1.15+2-dev on a fresh d7 7.31 instance.

When ckeditor_load_plugins() is called, it cannot always find media_wysiwyg.ckeditor.inc which includes hook_ckeditor_plugin() and hook_ckeditor_plugin_alter().