Many people at Apple don’t have private offices today. I think this may only be true in some of the main IL buildings. I’ve been in open plan for two years now since moving to Sunnyvale and still dislike it.
I think you're right - I interviewed with 3 groups onsite at Apple, and two groups seemed to have cubicles. I ended up choosing a group in IL1, which turned out to have private offices/offices of two. At the least, I know this is true of IL1 & 2.