By the way, Archian, regarding the new rank icons. Have you considered getting rid of the Blademaster in favour of the Orc Warlock? It could make a nice prelude to Gul'dan, and the Blademaster is honestly not the greatest (the blue hero border really ruins the style).
EDIT: Although ruining the 4-hero dynamic would probably be bad, and besides the smaller version doesn't look as bad I expected... Scratch that, I suppose. The Orc Warlock certainly has one of the coolest Orc icons though and is the only 'missing' Orc unit (other than beasts).
Alternatively, the icons leading up to Chaos Grom could be Chaos Peon, Chaos Grunt, Chaos Wolf Rider, Chaos Warlock and Chaos Blademaster, but that would require major restructuring and I'm not sure what you think about that... The heroes are a little bit unintuitive because they're not technically "above" one another, many would consider the Blademaster a higher-rank character than, say, the Far Seer or Shadow Hunter for instance, and you can't really rank them considering they're balanced. The units make more sense because they have a clear sense of progression in regards to tech, abilities and strength.