Board Thread:General Discussion/@comment-5558184-20130720121946/@comment-12705716-20130720172744

Well, its possible taht Yang's eyes changed color because of her awesome "super-satan" move. You know, red=fire and all that. Or it could be a natural eye color change. Her yellow hair DID just turn orange...although thinking about how purple changed to red...its possible, even remotely, that it was because of the lighting.

But I think it may simply be related to her "super-satan" powers. If you look closely at Yang's trailer, you'll see that the moment she put her foot down, literally, her yellow hair burned more fiercely than it did when she punched her gaunlets together, and that's when her eyes changed.