In the time window just before release apps with WatchKit extensions went from "Waiting For Review" to "Ready for Sale" in less than 24h with the "In Review" time lasting less than an hour. Now we're back to 48 - 72h review times
My thinking is that if you want to say you have thousands of apps on launch day, but barely any developers have run their apps on real hardware, you have to relax your standards a bit, and figure it will work its way out in a month or two.