New scans show that all the Part 4 characters from ASB are in (plus, as a reminder, they added Yukako).
Those that buy the first print run will get Part 4 Jotaro added as well. (Can't play as him in story, or choose a team of two Jotaros).
Finally they announced a new stage show for Tokyo Games Show:
September 20th, during TGS.
15:30 to 16:20 (Japan Time)– The Gates to Heaven Have Opened! JoJo’s Bizarre Adventure: Eyes of Heaven Extreme Stage – Featuring Yoji Ueda, CyberConnect2’s Hiroshi Matsuyama, and Bandai Namco producer Noriaki Niino.
EDIT: Oh! The game's Japan release date was revealed: December 17th of this year. That's kind of close...