I don't know if it's just me -- but I think the developers forgot more roots -- or I haven't found them.

There is a fallen tree in Grizzly Hills known as Andrassil, the "Crown of the Snow."

Obvious one: Elun'ahir in Azj-Kahet -- planted by Eonar (Pantheon Titan).

Later in the video, I fly around the zone showing the far edges of Harandar for the skybox. You reach an area known as Nihil -- which is latin for "Nothing."

I discovered a hut with many paintings of the world: Kul Tiras, Gates of Zul'Aman, Thunderbluff -- among them.

There are 4 roots in Harandar that lead to the World Trees:

Nordrassil (Mount Hyjal)
Teldrassil (Darkshore)
Shaladrassil (Val'sharah, Broken Isles)
Amirdrassil (Dragon Isles)

Spoiler: Allegedly, the cradle at the top-center is where the Worldsoul was ripped from by the Titans.

Watch this World of Warcraft: Midnight (Alpha) video exploring outdoor Stratholme. You can fly inside Stratholme through the fog. NPC hints something happening inside... future patch content?
youtu.be/0haX7WUMrAA

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I got dismounted and landed on the street and died. That means... maybe the developers want to do some kind of outdoor event in a future patch?

Inside the orange fog above Stratholme, you can see the city the same way you see it in the dungeon. There is the textureless Naxxramas-like nexus hovering above the city (beneath the fog).

I recorded flying around Stratholme in search of a port/harbor. There is a small peninsula in the corner with Eversong Woods that might qualify as a former harbor if a tunnel connected it to Stratholme.

If you read what that NPC, Old Wilmar, says in this screenshot below - it is a massive hint that the developers might add some kind of update to Stratholme.You can actually fly inside Stratholme past the thick orange fog. You get teleported to the bridge seconds later, but u can.

Nexus-Point Xenas -- youtu.be/N1r14keLJc8
The Blinding Vale -- youtu.be/G92Vp0NdZFQ
Voidscar Arena -- youtu.be/njSmgSebpU8
Windrunner Spire -- youtu.be/KiTeZrIXezY

A giant bat-like creature spawns and chases you. You shouldn't feel comfortable flying back to a safe area. For as long as that red eyes icon is active, the bat is literally behind you, chasing you to kill you instantly in one hit. The farthest it has chased me: began near the pin mark to the west.