Those two nations got cut from Fallen Enchantress.  More time was spent making each kingdom/empire unique.  This is why.  The shells were left in and players can make their own custom sovereigns.  At some point I imagine they'll appear in an expansion or dlc.

It's also nice that even the AI can use them too once you set them up.....although fighting a character who I made after me was a little strange....but I did take a lot of stabs before I went down!

they already ingame, new heroes for this factions are present, i noticed theese faction when got champion from one.

there is completely no reason to not add two more heroes and add them to game by default. 

yeah I got General Carrodus as one of the level 9 champion picks (i think at 400 fame) and as far as i know, he's supposed to be the "canon" leader for capitar. I actually looked up Carrodus and Kul-al-Kulan in the XML files and re-created them as custom sovs for their respective faction. ha dto fill in some blanks since the Carrodus champion is level 9 and has stuff like Air 3/Life 3 which might be slightly overpowered for a level one sov

It's fairly easy to add them to the game as custom sov, so maybe the devs will eventually consider adding them back in as premade characters. I think the only real difference between the standard sovs and the custom guys is the voiceover at the very start of a new game. I could personally live without that, but presumably it wouldn't be that much work to record a person reading the few lines of text, either?