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