I think this is a pretty strong archetype as well. The Dragon Knight in DOTA2 is very iconic, and practically in similar vein of how Warcraft heroes were designed if we consider the DOTA Allstars version would have fit in perfectly as a Warcraft 3 Hero. A mortal knight that has martial abilities themed on Draconic abilities and an ultimate ability to turn into a Dragon; that's practically the same fantasy as what we'd expect from a Dragonsworn class.
I'd personally prefer them to be able to use 2H Polearms in one hand and a shield in the other, like a Lancer or a Dragoon. Those are the type of fantasy 'Dragon Knight' concepts I like the most.