According to latest Ragnarok AMA:
You can expect one NFT for each 10 or 100 Hive/staked Hive you have. Total number of NFT is unknown atm (between 3 and 33 millions for 400 millions of eligible Hive)
You have to claim their NFT somewhere. Details aren't known yet and Hive NFT aren't as easy to find as ERC-721 tokens . If you ever played Dcity, you know what I mean 🤣
thanks for the info.