[sbuk]

I don’t have the source to hand, but I’ve read (or heard on a podcast) that Job’s made that decision on stage. It surprised everybody, including the dev team behind facetime. So it’s less a case of Apple remaining silent, and more Steve being Steve.

[Noctem]

I don't know who made the decision (or when), but he did have a slide prepared that said "OPEN" [1] in big letters next to a FaceTime screenshot, which I'd assume means the decision was made at least before taking the stage.

[1] https://youtu.be/AmXc1Mjr5J4?t=5816