The legendary fighting franchise is back with over-the-top action, a wild cast of combatants, rocking reactive music, and C-C-C-COMBO BREAKERS!!! Choose your ultimate combatants each with fluid animations, unique combat tactics, and enthralling special attacks.
“Players who download the free version on its release, meanwhile, will instead have access to a single fighter, who will rotate among the cast weekly.”
Okey dokey I trust you
Source, in case anyone wants more details. https://www.pcgamer.com/a-decade-after-launching-as-a-free-game-on-xbox-one-killer-instinct-is-going-free-to-play-on-pc/
“Players who download the free version on its release, meanwhile, will instead have access to a single fighter, who will rotate among the cast weekly.”