Apple Watch 4 Release Date
As for the actual Apple Watch 4 release date, look for it to land a week after orders start.
If Apple announces the Apple Watch 4 on September 12th you can expect a release date in September, not October or November.
Apple's in-store release dates typically land the week after pre-orders start. So if that pre-order date we just mentioned holds up, we could see the Apple Watch 4 land in Apple Stores and participating retailers on Friday, September 21st.
Last year, Apple released the Apple Watch 3 the same day as the iPhone 8 and iPhone 8 Plus (Friday, September 22nd, 2018).