https://worldofwarcraft.com/en-us/ne...rrives-july-19
There is the pre-patch announcement for Legion, dated July 8th, 11 days before it was released on July 19th.
https://worldofwarcraft.com/en-us/ne...oth-october-14
There is the pre-patch announcement for WoD, dated October 9th, 5 days before it was released on October 14th.