The Expedition Awaits

Are there prerequisites to pick up the quest from Dawn? When I spoke to Dawn, they had no quest to give me (no ! above the head either). I checked that I didn’t already have a part of the quest chain in my log.

Siren Isle is the new zone released in Patch 11.0.7.

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• Unlocking Siren Isle in Patch 11.0.7
  
  You unlock Siren Isle by completing a questline from [npc=232132] inside the Foundation Hall in Dornogal. The quest The Expedition Awaits will start a short questline that will take you to [npc=230235], and eventually lead you to Siren Isle.
  
  /way #2339 41.8 26.2 Dawn
  /way #2339 73.2 6.0 Skaggit
  
  You will then go through an introduction questline that should take less than 30 minutes. This gives you access to the main activities on Siren Isle and the [item=228411].
  This is the list of all quests you can complete in Week 1 of the patch.
  
  The Expedition Awaits
  To the Siren Isle!
  Friendly Competition
  To Scan a Crystal
  [quest=84722]
  The Second Signal
  Cave Barging
  Buried Secrets
  The Radiant Vault - Unlocks [item=228411].
  Reforged Anew - Unlocks [item=228640] for your Cyrce's Circlet.
  The Circlet Calls - Teaches how to socket and unsocket your Cyrce's Circlet, unlocks world quests and events in Siren Isle.
  
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• Traversing Between Khaz Algar and Siren Isle
  
  There are two ways to go back and forth between Khaz Algar and Siren Isle.
  
  
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  2. Siren Isle Zeppelin
     
     The primary means of transportation to and from Siren Isle will be the zeppelin used on the mission, the Princess's Pride. After completing the introduction quest, she will be docked in Dornogal at the area where you initially found it, and you can talk to [npc=231541] there to go to Siren Isle.
     
     /way #2339 73.4 5.2 Dornogal - Sky-Captain Cablechamp
     
     In Siren Isle, the Princess's Pride will be docked in Floatsam Shoal. While you don't have flying unlocked in Siren Isle, you can climb into the zeppelin by using the attached zeppelin rope. In the zeppelin, you can talk to Sky-Captain Cableclamp again to return to Dornogal.
     
     /way #2369 69.7 49.4 Siren Isle - Zeppelin Rope
     
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  4. Siren Isle Mole Machine
     
     You initially get to Siren Isle via Zeppelin from Dornogal, and completing the introduction will bring a second method of transportation between Khaz Algar and Siren Isle - Mole Machine! A mole machine will be stationed just outside of Gundargaz in the Ringing Deeps and will take you to and from Siren Isle.
     
     /way #2214 46.0 30.2 Ringing Deeps - Siren Isle Mole Machine
     /way #2369 67.5 38.7 Siren Isle - Siren Isle Mole Machine
     
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Wowhead link to the entire Siren Isle Guide.

In case anyone missed it in the Quick Facts at the top like I did, and if you're wondering why you can't see any quest from Dawn, it could be because you're not level 80 yet.

You must be level 80 to pick up this questline. 😉