Iron Galaxy has an Anniversary Edition and a freetoplay version for its tenth anniversary Killer instinct presented. They have not yet been planned in more detail.
The anniversary edition of Killer instinct features a total of 29 fighters, premium content, a VIP Double XP Booster and much more. All previous versions are upgraded to the Anniversary Edition for free and at the same time the Definitive Edition is a thing of the past. Additionally, the Definitive Edition app and Killer Instinct Classic 1 & 2 are no longer included, but can still be downloaded by Definitive Edition owners. The free to play version of Killer instinct includes singleplayer, local and ranked modes and a weekly rotating free fighter.