I am loving the new hero types. They could probably still use some tweaking, but the concepts are very solid. However, we could still use a few more heroic types. I mean, seriously, where are the spell casters?
I'm not sure if Piranha and Snotling have some big 'magic system' update planned. But, if they don't, here are a few hero types that would add a splash of magic to the game.
Priest,Priestess or Cleric> There was some discussion around a healing mechanic on a thread I started. Although I proposed one mechanic, I actually preferred the one KGB suggested. Healing would be a chance for a unit to regain a hp after defeating an enemy unit in battle. A Priest type would give a % chance to heal to his stack. Group warding would also fit a cleric quite well.
Sorcerer, Warlock, Mage> DLR had a mechanic called 'lightning'. Lightning worked a bit like ambush, except that, instead of killing outright, it would halve the enemy unit's remaining hp (it would kill units with 1 hp though). Just like ambush but weaker? What is the point of that? Well, the other difference is that a unit with lightning would get a chance to blast each unit it faced in combat. Ambush only works once. Warding would be an effective defense against lightning.
Another interesting power for a mage would be 'magic portal'. With this power you could vector units directly to that hero. Buying additional levels in this power would decrease the transit time.