•Mastery: Shadow Orb has been renamed to Mastery: Shadow Orb Power - Increases the damage done by your Shadow Orbs. Each point of Mastery increases damage by an additional 1.25%
•Shadow Orbs *New* - You have a 10% chance for your Shadow Word: Pain and Mind Flay spells to grant you a Shadow Orb each time they deal damage. Casting your Mind Blast or Mind Spike spell consumes all Shadow Orbs, increasing damage of that spell by 0% per Shadow Orb, and granting 0% increased damage on your periodic Shadow spells for until cancelled. You can have up to a maximum of 3 orbs.
They implemented a new way our mastery works, it will effect all of our spells and personally I believe it was much needed and good simple fix to a broken synergy.
It now gives a bit of ramp time but with a functional mastery I can't complain. It has a bit of synergy with Evangalism + Dark Archangel in choice between high consistant damage via DoTs and hard quick damage with DAA + 3 orb MB.
They have yet to release %s of damage increase per orb for MB/MS and DoTs but I believe there is enough information to discuss the new mechanic and its possibility as a viable stat.