Well, SE said the new cast could be anywhere from 4 to 10 characters, they never did specify. Still, the list is off, cause Vaan has already been confirmed in Japan, yet the U.S. site only has one slot for XII; so I feel its safe to say that most of the numbered slots are simply the returning cast, and the site hasn't accommodated the new characters, in order to keep them a surprise.

Though, I do find it interesting that there is a mystery slot behind Lightning. Perhaps FFXIV's token character or maybe a hint of a non-numbered FF character?