The War Within data includes an interesting addition: a new heirloom ring. The data indicates that it will be a reward from the pre-expansion patch event or a new World Event present in Khaz Algar.
It seems like this new heirloom will be similar to Dragonflight when you could obtain Unstable Elemental Confluence during pre-patch and still during the expansion.
The ring is created using Lifeless Stone Ring, which casts Infuse Memories. This spell requires three reagents:
These three items are all Warbound, which is the new «bind on account» description tag. You are able to create these items by combining 20 or each lesser version of them:
The link from these «memories» to the pre-patch event or some world event comes from some related achievements: