While NIS America promises a reveal on Sept. 8, the websites source has some interesting details.
When looking at the website in developer move (Chrome’s pictured above), I was able to locate this image under media. Fans of Nippon Ichi Software’s various games know they tend to open with images such as that. In the case of that image, it matches the one seen in the first couple of seconds of Makai Kingdom Chronicles of the Sacred Tome.
Unfortunately, I could not locate any other clues as to what, if anything, else is included, but the return of Makai Kingdom: Chronicles of the Sacred Tome would be a massive win for players who never got to experience Zetta’s story.