I'm not claiming to be on to some massive discovery here, as anyone with more than 2 brain cells is able to see - The Death Knight Tier 11 Sets are most definitely 'Spec Coloured', Blood(Red/Orange), Frost(Blue) and Unholy(Green). However, I noticed that some of the previous T11 Sets are also 'Spec Coloured'. The Mage has Fire(Red/Orange) Arcane(Purple) and Frost(Blue). The Shaman sets are Resto(Green), Enhancement(Red/Orange(I assume this colour would be for Enh as their Signature Ability is Lava Lash)) and Elemental(Blue) the same result can be drawn from the Warlock sets aswell, however they came with 4 different colours, so perhaps not.
Anyway, what I was getting at is, perhaps Armour will be coloured by your Spec? With 25 Mans and 10 mans having the same loot tables(and thus the same ilevel Tier gear), specializations being locked to 31 points and the game calling you an Unholy Death Knight, Retribution Paladin etc on your character screen, it's think it's possible that the next step could be 'Spec Coloured' Tier Armour.
So anyway, this is just something I noticed when looking at the T11, I'm in not saying this will happen or if it's even possible, but I just wanted to post about it. Would people like this to happen? I most certainly would.