Blizzard has announced some Vault of the Incarnates raid hotfixes which includes nerfs to Mythic Kurog Grimtotem and Mythic Raszageth.
Dungeons and Raids
Vault of the Incarnates
Kurog Grimtotem
Increased the enrage timer to 10 minutes on Mythic difficulty (was 9 minutes).
Decreased the following enemies health by 15% on Mythic difficulty: