Blizzard
Please be reminded that the Great Vault rewards items based on your efforts in the previous week. That means that you should not feel pressured to push Mythic Keystone dungeons excessively over the next few days, as your Mythic Keystone dungeon reward(s) from the Great Vault immediately after the patch goes live will not be an item that can be upgraded with Valor. Keeping items unclaimed through the first week will have no impact on this.
After the first week of the patch, the Great Vault will offer gear that can be upgraded.
Thank you!