I think its close to the real deal.
Samsung could obviously have made the phone look any way they wanted it to, but they always tend to continue harping upon themes from their previous phones. I wouldn't be surprised if they chose to continue with a kinda Galaxy Note theme. In any case, I've seen quite a few "rumored leaks" of the SGS3 and this is probably the best looking one of them all.
"If you have an apple and I have an apple and we exchange these apples, then you and I still each have one apple, but if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas."