Apple typically doesn't announce that far out, though. They usually announce when their products are much closer to market, once they've got a device or two built and in hand that they can show off (like the recent HomePod and iMac Pro).

Granted, earlier this year we saw them meet with Apple-centric press to tell them "don't worry, we're building another Mac Pro, just not in 2017", but those present pointed out how un-Apple-like it was to make such an announcement.