Baine is actually acting on orders from Sylvanas

[Withpuppys-nazgrel (Withpuppys)]

getting Derek into the Alliance’s hands without him being suspected right off the bat.

and we immediately hand him off to calia, he can’t return to his homeland which means katherine is safe, and we know jaina appears in 8.2 so we know she is safe.

Though I think there is a chance that once Derek acts Slyvanas will spin it that Baine was in on the plan to drive a wedge between Baine and Anduin.

except we know he was arrested despite the horde’s best attempts to keep us from spying on them. jaina even knows about it saying she is worried baine’s life is in danger now.

[Merìngue-whisperwind (Merìngue)]

and we immediately hand him off to calia, he can’t return to his homeland which means katherine is safe

Not only does he get handed off, he makes it clear that he does not know how much effect Sylvanas had on him. Everyone knows he is a potential bomb, so he is not going to be left unsupervised. He will be watched.