Graces' Asbel was getting Suzaku comparisons from fans pretty much as soon as Graces was revealed, since they look similar, have similar "white knight"-style themes, and are both voiced by Takahiro Sakurai in Japanese. Code Geass is a Bandai property, Tales is Namco's...so a fan joke turned into a convenient tie in. At least that's how it's always looked to me. They tried doing a similar thing with Star Driver costumes for Xillia, too, though that never seemed to make as much sense. I think the Geass set is pretty cool as DLC costumes go, the character parallels are clever, but I also seem to remember the costume DLC for Graces costing 250-500 yen per individual costume in Japan - even if it did come out here (which I don't expect) I wouldn't buy it unless it were significantly cheaper than that.