The buffs to the Keystones won't take away how nerfed they are to Thunderlords
Pretty much Deathfire Touch got an overall "buff" compared to the already Warlords and Battle of Fervor where Thunderlords is still king. The Defensive keystone masteries are ok like Grasp is still good on Tanks and etc.
However Thunderlords is still really good. Don't be surprised by 6.1 you still 9-10 thunderlords because the other offensive keystone masteries still suck.