Well, after getting Tohru Furuya, who else could be the voice of Dark Vader?
But holy shit, fucking Gintama. Set up entire arc as real robot parody, change it to super robot for the finale. Oh maaaaaaaaaaaaaaaaan.
And crap, the preview looks like they are going to reference/parody Gunbuster somehow lol. I feel like I am going to die laughing yet again.