In the next data push, you will find Omen of Clarity has been changed a bit.
The 10 second cooldown has been removed, the procs per minute has been raised from 2 to 3.5, and
melee abilities no longer trigger it. Spell interaction with Omen of Clarity remains relatively unchanged, with its hidden chance to trigger off spells reduced by half (and rolling the dice about 2x as often).
What this means is that more auto-attacks landing on the target will increase the benefit from Omen of Clarity. Haste, increased hit chance, and expertise will all make Omen of Clarity better.
Omen of Clarity (Restoration): Now a passive spell. Now also works for spells (healing and damage). Proc rate is roughly 6% with a 10 second internal cooldown.
