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On the initial 7.2.5 PTR, we are trying out a version of Essence Font that is even stronger, but has a cooldown. In addition to some combination of a healing increase and mana cost reduction, the duration of the HoT will be increased.
Essence Font having no cooldown has held back the spell and the spec in a few ways. It essentially says that three relatively heavy heals (Essence Font, Enveloping Mist, Vivify) have to compete with each other at all times. The texture of using a heavy spell on a short cooldown, then falling back to the decision between spammable spells (selecting based on cost, number of targets, etc.) is common among healers for good reason. And Essence Font's HoT mechanic that improves mastery is meant to specifically enhance that sort of gameplay, and will be more effective on a spell with a cooldown.
As already mentioned, the first change that comes along with it is buffing Essence Font itself. It no longer has to be held back by "if it gets too much stronger than e.g. Vivify, people will only use Essence Font", and can simply be a high-priority spell. We will make other adjustments as needed for gameplay or tuning.