I'm calling shenanigans and like Sephiroth, I feel this game is probably already being worked on and has been since the Compilation was announced.

Personally, I still feel it would be better if SE made the main game use the KH/Crisis Core engine and then used the Advent Children stuff for the cutscenes with maybe a few more scenes given the full CGI treatment. At least this way we don't have to suffer through the god awful AC desings of the characters and stick to the game's anime roots in terms of design.

I also don't see why they really need to add the Compilation info to the main game. I know too many VII fans who said they would probably not like the game as much if they tried to pack all that BS into the game. My feeling is why bother? It would be better to make the game you know that sells than try to tamper with it and get the ire of the fans.