Here are the screenshots about tiers 5 sets for World of Warcraft. worldofraids.com said Fanatik @ Emupedia.com extracted the tiers 5 and explained Why the new sets are tiers 5.

------------------------------------------------------------

Now, why do we think they are TIERS 5 and NOT ALTERNATIVE TIERS 4 ? Because of Blizzard, who archive his sets. See this picture @ Bronx :
 
As you can see, the precedent tiers for example, for warrior, get the name :

RaidWarrior_A_01 => A = Tiers 1
RaidWarrior_B_01 => B = Tiers 2
RaidWarrior_C_01 => C = Tiers 3

So if we follow this logic, the tiers T5 set of the warrior must be :

RaidWarrior_E_01 => Tiers 5

And it is.  If there is an alternative set for T4, it means to be :
RaidWarrior_D_01
RaidWarrior_D_02
RaidWarrior_D_03

etc.

------------------------------------------------------------

Here are some unveiled screenshots for one class, you can see all the screenshots at HERE

Paladin