User blog comment:Ygrain/ME sequel: what shall we do with the extinct races?/@comment-5008642-20121124055541

Simple, if you spared them in ME3 then they'll be seen in ME4 and if they were killed then you won't see them, it's like the Asari woman on Illium, if you save the Rachni queen you see her, if you kill the queen you don't see her. Or like if Garrus dies in the Suicide Mission in ME2, Liara takes over a lot of his lines. ME4 will just have to make references and change a few skins, lines, and names to fit the ending you got.