The most important information from the Japanese Magazine Gemaga is as follows:

The secret movie is connected to what is coming in the future! Nomura says it would be a shame if you miss out on it. This disproves any theories about Kingdom Hearts III itself taking place in the past, although there may be flashbacks.

A scheduled announcement of the next Kingdom Hearts Project will definitely take place after the summer! (He’s now saying this in every interview he has. He must be excited!)

Nomura states that it is too much work to work on both at the same time. So they are concentrating on completing Final Fantasy Versus XIII first to acquire the necessary elements that they can incorporate into Kingdom Hearts III. This could include characters, locations, gameplay features, or something else.

Final Fantasy Versus XIII will be the last Final Fantasy Nomura will direct, as he wants to concentrate on Kingdom Hearts series instead. So there may be a very big future for Kingdom Hearts and it sounds like it won’t stop at Kingdom Hearts III!