They modified GG
I have to admit...one of the reasons I was toked about General grievous was the fact that he wasn't like an Bad guy we had seen thus far. No one knew a lot about him...and exactly how he came to be was a mystery to everyone. When ILM came out with that awesome GG poster months ago (the one eventually used on the cover of Star Wars magazine)...grievous was so cool looking because he looked non-human. His eyes, yellow and long...made him so awesome.
But now...with that "finished" shot of GG on the OS and the new Burger King posters and ads on Tf.N, it's pretty obvious GG's been modified:
He has "human-type" eyes...
I liked the old way better