Xivu Arath will 100% be involved in Heresy, they're just hiding her

Proof: https://youtu.be/5Pi5wUL4JAQ?t=627&si=kIS1DhcbWWkr4Hxs

The final cutscene in TFS before the "staring at the traveler" part teases the 3 episodes:

First, we see Failsafe surrounded by vex (Ep1). This is then followed by a scene of Eido going to talk to Mithrax and a scene of Variks and the Spider looking at holograms of Fikrul and Eramis (Ep2). Right after that, is a scene of Xivu reaching for a blade.

Crow also mentions Xivu still being out there at the very end when talking about the Witness's followers.

They're keeping the story close to the chest right now but I guarantee there will be involvement of Xivu at the very least.

Edit: I really don't care about your opinion on the state of the game. Take it up with the stream thread they have pinned. I posted this to clear things up bc people like Paul Tassi were saying "where's xivu?" Stay out of my notifications if you're just gonna whine.