Game 1
>Space Marines
>Chaos Marines
>Orks
>Eldar

Game 2
>Tyranids
>Tau
>Dark Eldar
>Imperial Guard

Game 3
>Demons (once again CA is gonna pretend they're totally 4 different factions so they can be lazy)
>Sisters of Battle
>Necrons

DLC/Preorders
>Mechanicus
>Genestealer cults
>Grey Knights
>Custodes
>various packs with differeent subfactions

This is 100% how its gonna be btw