Question was about respec our companions in general. And Swen replied something like: There are subclasses of two companions that stay locked, but beyond that you can respec anything you want.
My understanding is that Wyll cant be speced into GOO/Archfey Warlock ... and Shadowheart into non-Trickery Cleric ...
//Edit: But i wouldnt read it as "including race" ... I think that was just poor wording on Swen side, and it was just about classes.
Not a single word about Hirelings tho ... and all my questions about them was automaticly filtered. -_-
Did he mention Shadowheart? Because I would have thought Karlach was more tied to berserker than Shadow is to trickery domain.