Ruliweb have apparently found some official artwork of Final Fantasy XIII and Final Fantasy Versus XIII. It's apparently official, but there's nothing proving that it is or isn't. The only reason I'd think otherwise is because some details are incorrect and they don't look much like Nomura's designs. In any case, the art does show a new character for Final Fantasy Versus XIII who is dressed quite a lot like The Prince... a bodyguard? We'll get more info as it comes, until then enjoy the art.

Final Fantasy XIII - Blonde Man Artwork
Final Fantasy XIII - Enemy Soldier Artwork

Final Fantasy Versus XIII - The Prince
Final Fantasy Versus XIII - The Driver & Scar Face Guy
Final Fantasy Versus XIII - New Character

Source: Ruliweb
Via: OnAXIS

Update: It looks as though, as earlier thought, it's not official art. We have come to this conclusion in the forums thanks to BlankChocobo translating the little note next to the Blonde guy, which reads: "Wanna ride my bike?" XD