The Dzemael Darkhold preview came out 11 days before the patch did.
The Ifrit preview came out 3 days before the patch did.
The Good King Moggle Mog XII preview came out 4 days before the patch did.

Notice how close the previews were released to the actual patch days?

We still have at least ~3 weeks until patch 1.21 comes out. Patience, my friend!