This isn't an official reveal, but the PS Store was recently updated with the following text:
Contains 6 additional characters: Akuma, Kolin, Ed and 3 brand new fighters join the fight! Akuma, Kolin and Ed are available now and will be followed by the 3 additional characters throughout the year. Each Season 2 character comes with a Premium Battle costume with colors 3-10 unlocked. Additionally, Street Fighter® V Season 2 Character Pass holders will receive an exclusive PS4 theme and default costume colors 3-10 for all Season 2 Character Pass characters!
The next character was actually supposed to release today, but he ended up getting delayed. I guess no one told Sony!