Check this out http://forum.eternalcrusade.com/threads/the-first-foundings-q-a.1027/ yes the iconic units wont be in at launch as of now but we still have two years till launch alot can change in two years
Again, I know it is planned 'for the future', but having chaos with no chaos specific units, is re-skinned space marines.
I just hope we can dedicate our characters to one of the chaos gods. Or there is specific god gear since we only have undivided. Thats what I hope they are going to do.
Still apprehensive considering slaanesh is well known to get the shaft in games(and books) compared to the other gods.
re-skinning alone is quite troublesome for devs already, remember what they said, chapters are not identical in the same faction. So imagine 5 x 5 x 100 (chapters, classes, armor/loadouts) = thousands of model, art, algorithm works. If this game become a huge succeed after 2 years from release date. I don't see why they shouldn't go deep into the universe. For the time being I think CSM are not re-skinned, because they can worship a specific Chaos god and their devotion to one god make them different just like Savij quote in post #3. So different gods, different loadouts, same skin atm. In future, iconic....everything.
I remember reading somewhere (propably mmorpg) that chaos will have an unique mechanic regarding health regenation. I think some developer mentioned life stealing as a thing so that -might- be a sign that there's atleast some Khorne infulence in the game at launch. Again, I'm not entirely sure but that's what I remember.
As Librarian being only a special class (the team must spend resources to equip one dude as it), I'd only imagine how one could be a Thousand Sons with such restrictions... I want to warp-**** my enemies with only a gaze! A lot of times!