Honestly I have to agree with the majority here, splitting it into two parts will probably make for an overall nicer release, V13 will let us continue the story and stuff like Ana's quest, then V13.5 will give us the other content later on, which will probably help make V13 come out better, less stress on the dev team is always good, and we get what will probably amount to an overall smoother experience of the new content.
Much love to everyone on the dev team, it's been a crazy year but if we all take of ourselves and each other, then we'll make it through.