Blizzard has now officially commented on the Primordial Stone tuning that has occurred today.
Today's Changelog Edit #1 (12:39 PM PST): Humming Arcane Stone nerfed to have a 20 second ICD. Edit #2 (2:04 PM PST): Swirling Mojo Stone nerfed to no longer have mojos (Breathing Mojo Crystal, Shadowy Mojo Crystal, Hateful Mojo Crystal) go to your mailbox and are Unique (1). Wind Sculpted Stone/Wild Spirit Stone interaction removed. Edit #3 (4:00 PM PST): Wild Spirit Stone nerfed by 10.7% (now 52.2% increase today), Exuding Steam Stone nerfed by 25.6% (now 25% increase today) Edit #4 (4:34 PM PST): Blizzard has confirmed the tuning hotfixes that occurred today. Hotfix ListHere are the changes in the hotfixes, in addition to the previous 25% buffs and the ability to crit earlier today. Thanks to Dorovon for helping to calculate these buffs.
Searing Smokey Stone — Effect buffed by 34% Raging Magma Stone — Effect buffed by 12% Echoing Thunder Stone — Effect buffed by 12% Flame Licked Stone — Effect buffed by 12% New Flag: Rolling Periodic 6.299854/5.624381 4.499163Storm Infused Stone — Effect buffed by 34% 28.397224/21.127768 16.902214Desirous Blood Stone — Effect buffed by 18.5%RPPM reduced to 2.25 (was 2.5) 32.653557/27.552458 (22.040937)Pestilent Plague Stone — Effect buffed by 72%New Flag: Rolling Periodic 2.722413/1.580094 (1.944336)Wild Spirit Stone — Effect buffed by 52.2% (buffed 70.4%, nerfed 10.7%) 1.954597 2.188874/1.284254 1.975117Exuding Steam Stone — Effect buffed by 25% (buffed 68%, nerfed 25.6%) 27.350668 36.759411/21.880194Cold Frost Stone — Effect buffed by 12% 55.139111/49.230862 39.38435Freezing Ice Stone — Effect buffed by 12% 41.14571/36.737179 29.389059Deluging Water Stone — Effect buffed by 21.7% Read more on wowhead.com