Apple's yearly developer conference should see iOS 8, OS X 10.10, and likely some hardware.
Apple's Black Friday Promo: Ready. Set. Shop.
Shopping event is available only at the Apple Online Store on November 23 from 12:01 a.m. to 11:59 p.m. PST and at Apple Retail Stores. Check your local Apple Retail Store for special hours. Sale prices are limited to stock on hand and while supplies last.
Historically, Apple's Black Friday sale discounts have been modest (old price lists). The exact discounts will not officially be announced prior to the sale day.