There's an interesting change for Chalice of Harmony in the Preseason
Live version:
UNIQUE: Grants 100% base health regen per 5 seconds if your current health percentage is lower than your current mana percentage. Grants 100% base mana regen per 5 seconds if your current mana percentage is lower than your current health percentage."
PBE version:
UNIQUE Passive - Harmony: Increases to your % Base Mana Regeneration stat also increase your % Base Health Regeneration stat by the same amount."
I doubt it will get much attention, but the change is interesting change to me.