Thursday is usually the test realm days, so we could see alpha drops tomorrow.
Realistically, I am hopeful that Dragonflight will be a good expansion. The initial release patch is in a good place to launch, we get some updated systems for things that long needed it, a new class/race, we will see the story and exploration of the Dragon Isles and they will release the first raid.
I think this method is giving them a better baseline to put down so that way they can add a new system of sorts (Be it a borrowed power, or Torghast/Mage Tower experience) in one of the .X patches. FFXIV for the most part does this with their expansions, focusing on the story first, then adding new systems and additions in the subsequent patches.