There is barely any information out on Final Fantasy Versus XIII for good reason. The publisher, Square Enix has had an information blackout on the game for sometime, allowing Final Fantasy XIII to breath.
According to IGN, it appears that Tetsuya Nomura, director for Final Fantasy Versus XIII, wants to reveal everything about the game. However, Square Enix has put a gag on the Nomura as it conflicts with the publisher’s policy.
Apparently Square Enix doesn’t want to shift focus away from what the publisher has released recently. Nomura explains that Square Enix only promotes games in the order of release.
Nomura also provided some interesting information about Versus. He stated:
here have been many questions regarding fields. It’s not a completely open world. It’s like the 2D FF games in HD. Although, in terms of looks, it’s not a top-down view, it’s like the screenshots that have been released. You’ll move through the world from that view.
Its not clear what he exactly means but it seems like we won’t be getting an isometric view of the game. I suspect that the developers will reveal the game during TGS.