So suddenly the release of the new patch is almost upon us .. 26th June for those of us on EU servers:
The new raid will not be released straight away, but will come a couple of weeks after, in July.
Wowhead has the following to say:
This new content patch will include two new zones, Nazjatar and Mechagon. Each zone comes with a large zone to explore and two new reputations per faction to acquire reputation for (Rustbolt Resistance and 
The Unshackled / 
Waveblade Ankoan). Exploring the continent and acquiring Revered with each of your faction's new reputations will earn you 
Battle for Azeroth Pathfinder, Part Two, allowing you to fly in all of Battle for Azeroth's zones!
The Heart of Azeroth will also play a larger role in this patch with a full quest chain and the brand new Heart of Azeroth Essence system. This patch also comes with mount equipment, the continuation of the War Campaign, Heroic Warfronts, two new Island Expeditions, Heritage Armor for Tauren and Gnomes and the Stratholme Pet Dungeon.
More content in coming two weeks later on July 9th when Season 3 of Battle for Azeroth begins. This marks the opening of the new Azshara's Eternal Palace Raid, new PvP Season and new Mythic+ Seasonal Affix, 
Beguiling. Season 3 will also come with an overall Item Level increase, with Mythic Azshara's Eternal Palace dropping Item Level 445 Gear and an increased Item Level from Mythic+. Season 3 also increases the number of available Essences, as many Essences will only be obtainable once Season 3 begins.
Dev insights:
