I don't see a way to add a dragon race to Doms 3. How could it be balanced? Dragons are supposed to be rare and mighty. We will definitely add dragons for various races as a high cost summon....but as a race...I just don't think that it would work. Just imagine a dragon with 50-100 HP, that wouldn't make any sense. Well maybe a half-dragon race could work, but that race would be a bit odd.
Lizardmen on the other hand will be perfect for a race.
They can get dragons as national troops, but only as high summons. Dragonlings could work as low level summons.
Just my .02
