Clerics are in the "Priests" class group with paladins and druids. The level progression follows the same pattern as expert classes did: ASIs are replaced with the opportunity to take feats (one of which is an ASI, so not that different in actuality).
The last feat/ASI comes at level 19, and an epic boon is now taken at level 20.
The only epic boon that is restricted to the Priest group is the Boon of Truesight, which gives you 60 feet of truesight, which is the same as the boon under current rules. That feels a little light-weight to be capstone ability.
Oh hey, this is new: The Banishment spell incapacitates the creature while it is waiting to be returned to a plane it is related to.
We've got the Cleric with one subclass: life domain. We've also got revision to Ardlings, Dragonborn and Goliath.