Yes, they are here!
Hive Creators now can allow hive users to subscribe to them, and enjoy unique - exclusive content!
I have just read about it, and the first person to subscribe to was ... 
First things first - let me be one of the first ones to subscribe to Khal!
I will click on the subscribe (watch me as I gain a crown!)
Not sure why, but I had an issue doing it via KeyChain, so I did it manually
I am very excited and look forward to seeing how this is being utilized.
Now, lets see who you can set up your creators subscription to others and if there are any limitations.
In my opinion, setting up a subscription offer - means that you are going to share some exclusive content with your subscribers.
It is extremely simply to do so.
At the moment the monthly subscription is set to 5 HBD. (Not sure if this will change in the future - but make sure to join the AMA today on x and on inleo to learn more)
You visit your settings page: https://inleo.io/settings
You need to be a premium user (Thankfully I have the yearly premium membership!)
And you tick this bar - (dont forget to save after that!)
Now I need to think what I shall offer to the subscribers (if I manage to acquire any, hahahah)
That's it for now, I am so excited for what is being unveiled .. step by step!
More about it soon!
Let me know if you got queries so that I can make a guide about this :)
Useful Links:
Announcement: @leofinance/introducing-creator-subscriptions-paywall-encrypted-content-on-hive-earn-more-crypto-65a
Khals profile where all the inleo.io news pops: https://inleo.io/profile/khaleelkazi/blog