Don't get me wrong, i'm amazed that they release something for people who are C.Blind.
But I really don't hope that it can get abused as it does in League Of Legends by Riot Games.
Basically what the C.Blind mode does is that it adds another layer to all abilities and objects so you can easily detect them.
Which worries me that this might get abused in PvE. Could be hilarious in a way if they managed to screw up and show us the abilities before the boss even used them.
So i Really hope Blizzard knows what they are doing