It’ll be good if she is. I’ve always felt her “ending” was vague and disappointing the way it had been left as captured and dead or in a dark dungeon somewhere (at least that’s the last I knew of her/ hadn’t read Shadow of the Dragon).
Why would Yori and Katana work together though? I kind of thought they’d be pretty hard set against each other, but I may have the more recent stories confused.
Their enmity, I think, was more Toranaga setting them against each other than anything else. Personality conflicts and the whole Kurita-family massacre aside (which wasn't Yori's doing, obv), I think they have more in common than they do differences, at least where the Combine is concerned.
But I'd read Shadow of the Dragon, since it at least gives a solid look at where Yori is at mentally prior to the Toranaga brouhaha in The Damocles Sanction plus an insight into the "why" question.