I can't see either of these getting released tomorrow, iOS has been released a week after it was officially announced, just a few days before the first iPhone shipments arrive. As much as I want it tomorrow, I just can't see it showing up for download.
As for the OS X update, I don't think they've ever seeded an update one day and released it on the next. Makes no sense.
Sorry to say they'll both be released on the 19th, based on last year's timetable, one week after the media event.
But this way we're gonna get two great days! ::grin::