Actually, I heard from one of the officials saying they have already handed out 39 acceptances (even though they expect many students will be making decision and might not choose UCLA).
They are working on reviewing files and sending out interview invitations though.
They just started interviewing November 12th, and they only interview a few each day. When I went, there were only 4 applicants. So I think that it's pretty common for them to interview after December.