As has been previous posted, Ruby is staying for (at least some of) Disney-fied "season 2", but is being joined by a second companion ...
who is probably her replacement when she rumouredly leaves.
Varada Sethu Confirmed as New Companion
To Ncuti Gatwa’s Fifteenth Doctor (With Millie Gibson!)
<
https://thedoctorwhocompanion.com/2024/04/12/varada-sethu-confirmed-as-new-companion-to-ncuti-gatwas-fifteenth-doctor-with-millie-gibson/>
Bit of a come down. Varada Sethu has been in big US hits like "Star
Wars: Andor" and "Jurassic World Dominion", as well as a few other UK
shows.
It's also a bit confusing, with the Doctor Who baddies called Vashta
Nerada. ;-)
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* Origin: A noiseless patient Spider (3:633/280.2@fidonet)