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Since dragons are now only leaders, I would like to see the Sylvan faction in the following form in the next installment.
Core creatures: dryads for magical support (possibly healing) and flight; archers for ranged combat; satyrs for melee combat and maintaining high morale in the army.
Elite creatures: ents for melee combat and limiting the opponent's mobility; pegasi with riders for suppressing enemy magic, participating in melee combat, and flight; unicorns for the same magic suppression, melee combat, and neutralizing the enemy.
Master creatures: phoenixes (we already know their abilities).
Druids are moved to the magical class of Sylvan heroes, and blade dancers are placed on pegasi.
Regarding the Dungeon faction, I have nothing to say, as I don't like its new version led by dark elves. Although... I wouldn't mind seeing hydras as champions (they deserve it) and manticores in the elite instead of one of the elven units. I also hope to see warriors from the faceless and a shadow-like creature, similar to the Dark Elemental. Plus, minotaurs. That's 2 free slots for elves. We can take assassins and witches.
In Academy, everything is standard; it's already a well-established order.
Fortress... I'm not sure if this faction will be included in the game. The first three factions are literally required, but there's less interest in dwarves. Although, I would be glad to see them again. For the sake of completeness and variety. Besides, someone has to occupy the northern lands. But it's easy to reason and want, of course, but funding the creation of another side in the conflict... is not my business, so I'll be quiet.
And Sanctuary. I demand flight for kirins, spirituality for snow maidens, and a wet attack for stream spirits.