There are serious concerns about how Zekhan and Rexxar were handled as characters in Exploring Azeroth II: Kalimdor, but I believe there are posters that can suit that analysis more justice than I can (preferably in a separate thread), but here I will do my best to summarize the lore points brought up by the book and the standing of the setting between BfA and Shadowlands, as this travel takes place before Thrall is abducted by Mawsworn. I will leave out information that isn’t new to the setting, as much of the book is a recap of what we already know from Classic, Cataclysm, or other sources like Chronicle.
Durotar:
- Tiragarde Keep was restored during the mission table missions by Keep Watcher Kerry and it is currently staffed by Alliance Nortwatch Expedition guards.
- Durotar relies on water shipments from Mulgore to sustain itself due to the pollution from Azshara contaminating the Southfury River and Watershed.
- One of the Echo Isles is named The Isle of Night, which homes a large tree and a shrine to Hir’eek.
- There is a new dock at the Echo Isles that supports travel to and from Zuldazar.
The Barrens:
- The Alliance still holds and is fortifying Honor’s Stand.
Azshara:
- Gallywix’s Pleasure Palace remains even with Gallywix gone.
- Bears (or at least Misha) like riding the cars on the rocket tracks.
- Ruins of Eldarath are once again held by the Naga.
- Talrendis Point is still held by the Night Elves and are attacking Valormok, with Zekhan worried the Night Elves will take control one day.
Mount Hyjal:
- Spirit Beasts (the Beast Mastery tamable creatures) are bound to Aessina.
- Angering Spirit Beasts on Hyjal will lead to one appearing and tearing the offender to bits and then the Spirit Beast will vanish out of sight again, shifting between Azeroth and the spirit realm (I am assuming this being the Emerald Dream).
- The great owl spirit Ban’thalos is Malorne’s ally, and they fight together against the Legion in the War of the Ancients.
- Not mentioned: Current state of Night Elves on Mount Hyjal.
Earthen Ring:
- Still made up of Horde and Alliance working together to heal Azeroth.
Darkshore:
- Tablets from Bashal’Aran mention multiple types of Avatars of Elune, one avatar type for each phase of the moon, with the Night Warrior specifically being the Avatar of the New Moon (names for the other avatar types not mentioned).
- Before the formation of the Kaldorei Empire, the Night Elves invoked Elune’s wrath against the Trolls (with this Night Warrior likely having died from the power after).
- Before the Catalysm the Shatterspear had a bargain with the Night Elves to not expand further into Darkshore and the Night Elves would leave them in peace - though also would not come to their aid if they were in danger. After the Cataclysm they joined the Horde, but now after the Fourth War, while still maintaining peaceful ties with the Horde, the Shatterspear have also resumed their peace bargain with the Night Elves.
- The Ancient of Lore Onu was not killed in the Horde world quest at Darkshore, and while Onu acknowledges the war with the Horde, even after that he is still friendly with anyone who is an ally of nature.
- The Army of the Black Moon has moved on from Darkshore to focus their wrath elsewhere (likely Ashenvale and Azshara).
Teldrassil:
- Rexxar had traveled around Teldrassil after the Catalysm.
- Denalan discovered how to cure the Timberlings on Teldrassil, and developed enchanted soil that could purge corruption, but he died in the burning of Teldrassil and the knowledge was seemingly lost with him (luckily the Night Fae player saved Denalan’s soul from the Maw and he now resides in the Heart of the Forest in Ardenweald, so his knowledge is not actually lost).
- After joining the Alliance the Night Elves opened their homes to the other races of Azeroth, obviously most notably the Gilneans.
Azurmyst and Bloodmyst Isles:
- Also known as Nar’valas, before the Sundering these had been mountains that had been intentionally left uninhabited by the Night Elves to be used as hunting grounds for wild game.
- The Exodar is fully operational again and ready to travel, but rather than leave during Legion the Draenei decided to unite Azeroth and take the fight to Argus by the Vindicaar.
- The Night Elves had settled Silvermyst Isle because it was so close to Teldrassil.
Ashenvale:
- The Night Elves took Astranaar back after the War of the Thorns and fortified it.
- The Night Elves have a new Alliance camp by the entrance of the ruins of Zoram Strand.
- Splintertree Post and the Warsong Lumber Camp are still being attacked by the Night Elves.
- Priestess of Elune are now tending to the Howling Vale and the Shrine of Mel’Thandris and singing prayers to the Worgen spirits there.
- Stardust Spire still stands, and Huntress Jalin and her Sentinels destroyed every single siege weapon the Horde tries to bring through Stonetalon.
- Mor’shan Ramparts are once again held by the Alliance.
- Not mentioned: Maestra's Post, Zoram'gar Post, the Shrine of Aessina and Big Baobob, Silverwing Refuge, or Forest Song.
Silithus:
- The Cenarion Circle has reestablished Cenarion Hold and has repaired Staghelm Point and planted a Sentinel Tree (like the one in the Firelands).
- One of C’Thun’s eyes was presented to Saurfang by the Alliance forces that killed the Old God.
Cenarion Circle:
- Still welcomes druids regardless of where they hail from.