Can we talk about those NWC HV pictures here?
I recall from an old Round Table post (StrategyPlanet era) that someone visited NWC, and saw the six HV towns listed on a blackboard. In fact, I'm sure many people here still remember it.
Castle, Dragon, Fairy, Myth, Necropolis, Wizard
I made those speculations when I first saw those pictures at Heroes Community:
There's no Angel render, maybe because it's simply not finished. The Fairy town has 7 units, the Castle town only has 6 now, so there's an open slot.
Catelf - an elf/white tiger hybrid? A unique elf species in Axeoth?
Lionman - I believe this to be a Werewolf. His weapon is a metal claw. It might be a Wolverine reference, just like how H3's fire elemental is a human torch reference, and H2's cyclops is a X-Men reference.
Firewolf - My instinct reaction is, this is a Qilin/Kirin, a sacred Chinese myth creature.
This one is hard to guess, as in HOMM, both Warlock and Barbarian towns had used myth themes. However, the concept arts show a Minotaur (always Warlock), a Cyclops (always Barbarian), a Harpy (H3 Warlock, H4 Barbarian), and there can't possibly be both a Barbarian town and a Warlock town. Then there's Valkyrie, a creature that's 1) mythical, 2) more heroic than the Warlock faction traditionally is, 3) from a barbarian culture, 4) more magical than the Barbarian faction traditionally is.
So I think Myth town is a fusion of Warlock and Barbarian.
Even back then someone suggested that a Dragon town might have to do with the long-rumoured return of Dragon Father.
JVC in the CH interview said that they are using H4's idea of each town having its own magic school. Thus there's both a possibility for Dragon/Lizard town to have its own "dragon magic", or for it to have no magic school of its own.