No, maybe they're waiting on it. Isn't there like a Square Enix Party or something? And don't get mad at me for asking this, but has the Tokyo Game Show happened yet? There's two events that 358/2 Days can be shown at (1 if TGS has happened already).
EDIT: TGS happens in October, while the Square Enix Party happens next month. Apparently the 3 KH games in development (Coded, Birth By Sleep, and 358/2 Days) will be mentioned there. So there, LynkW.