According to Tetsuya Nomura, who revealed explosive information about his other projects Final Fantasy Versus XIII and Final Fantasy Agito XIII on twitter, the two games won't be released for ages.
"There are a number of unannounced titles. These will come before Agito and Versus. Some have finished voice recording. Announcements will take place in Japan."
This means the games will not be seen at the Gamescom that will take place next week. Square Enix only shows The 3rd Birthday and Kingdom Hearts: Birth by Sleep. But they might appear on the Tokyo Game Show next month.
He also said the following about Final Fantasy Versus XIII:
"Versus has had many difficulties, and past method of production have been completely inapplicable, but these are the difficulties of birth, so we are working hard. We have a lot to announce, but because we're going in order, I can't say too much yet."
By "order" he means promotion of the games in order of release.
"There 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."
Nomura also touched briefly upon development progress for both Agito and Versus.
"Agito and Versus have different production styles and progress states, but they're both presently undergoing voice casting. 3rd's recording will end shortly. Next up is Agito."