I've given up griping about Disc priests. They haven't even mentioned bringing them in line.
The only reference I recall is when they mentioned that Holy Priest mana regen might be too low, or Disc might be too good.
The fact that they said, "Disc mana regen MIGHT be too good" just shows that they have no clue.
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That's only one of their mana return mechanics. Don't forget their absurd Fiend/Mind Bender mana regen mechanic.
*edit* They even buffed Mind Bender to give more mana back...I'm speechless.