Yes, yes. Japanes role-playing game Final Fantasy XIII-2 is getting downloadable costumes that include Mass Effect and Assassin's Creed outfits. If you didn't find the screenshots thrilling, here is the AC trailer... you might find thrilling.
I've said it once, and I'll say it again: I really don't understand the point of these cross game costume collaborations. If I want to play a character dressed as Ezio, I'll play Assassin's Creed. If I'm playing Final Fantasy, I'd rather play characters dressed as, you know, FF characters. I don't think that's an unreasonable request.