Actually dipshit, it's called "planning stages". Every series ever has gone through these "planning stages" and many characters get changed many times over before their design is finalized. What happened to those designs is the same thing that happened to many, many character designs: they were scrapped in favor of different ones, because something changed that made them unusable.
Fuck, at the time those designs were made the idea of Geass hadn't even come up. It was just a war animu. The whole series changed so dramatically that of course the character designs were going to be redone.