How will be the drops? Just like in 2.0 with 4 per bosses or all the raid will get it?
from patch note 2.1 :
"The drops for The Vials of Eternity have been modified. Vashj’s and Kael’s Vial Remnants are now multi-drop quest items. This means they’ll be lootable by each raid member who is on the quest, as opposed to the four vials that drop at the moment."
http://eu.battle.net/wow/en/game/patch-notes/2-1-0