That's what this countdown was about.
Developed by CyberConnect2 (people behind Asura's Wrath and the Naruto: Ultimate Ninja series) and produced by Namco Bandai, Jojo's Bizarre Adventure ASB is a PS3 exclusive and will be out in Japan this year. This is the official website.
"Every main character from Part 1 through 8 of the series will be playable. The game format is a battle between the various main characters. Hence all star battle." — Source
Also, this page is about how a new Jojo's Bizarre Adventure anime will also be coming out this year.