I don't know... I was a bit excited but after looking through various other articles on this 'leak', I saw someone else make a good point.
Look at an old GSII image:
Kind of suspicious. Sure, they rearranged the "Fast. Vivid. Slim" tagline, and one of the "I"s in the new "S III" looks wonky.
Not to mention that tagline that really can't just be attributed to bad translation, it's that awful: "What's your Smart life?".
I like what we see of this "Flight of the Navigator"-like phone, but I'm writing this off as suspicious.