Shoryuken is reporting that two new charactes have been potentially found in season 3 of Killer Instinct. The first character is Mira, Maya’s twin sister who was referenced in the first season’s story mode. Mira had sacraficed herself for her sister’s behalf and became a vampire.
The other new character is a guest character from Gears of War 1, General Raam. Not much is known about him, other than his inclusion in Season 3. He doesn’t even have a character model/portrait.
On top of that, a new  mode, Shadow Lords is making it’s way into the game.
Season 3 will be releasing on the Xbox One and PC later this month.