Well..this concept art collection shows how they imagine armored barbarian. I know what you mean OP .. but I doubt we will have classic plated character like in Diablo 2 (Paladin, Barbarian or even Amazon).. I can't imagine any from existing classes to be fully covered in plate armor .. The only class which make sense is Barbarian but it seems they are designing Barb to more nordish viking/marauder looking char.
Yeah I agree blizzard seems to be aiming for the Nordish armor style. I doubt they have removed paladin though because those guys were tough and I hope to see them in future expansions.