Shoko-tan (VA of Saori in SSOmega) posted the cover of the script of SSOmega episode 13 in her blog. She confirms that both Seiya and Saori will appear in the episode, which is titled “星矢のメッセージ！お前たちにアテナを託す”, roughly translated to “Seiya’s message! I entrust Athena to you guys”.

What a way to spoil the story, Shoko-tan!