Blizzard has announced that the pre-expansion patch of Legion will come 20 July. This update will include a large number of functions and contents to prepare the gameexpansion, including changes to the system, general improvements and important gaming events. Some of these features will be immediately available on July 20, while other content will be released in the weeks prior to the launch of the expansion. Through this link you can reach the page with the official and complete notes of the pre-expansion patch.Release Date: Summer 2016