Well there's a bit of talk of possibly there being new races upcoming (or for people to mod them in), so here's a possible list of ideas on that:
Ghosts: Capable of going through solid objects, but actively gains less stats per level.
Ghouls: Can consume dead bodies for increased max health permanently; but has a malus health regeneration.
FloraMan: Regain health and hunger in day light, does not at all during the night (Or in caves or in buildings)
Dwarfs: More efficient miners, losing less stamina when mining/mining faster.
Kobolds: natural lock pickers, small enough to get through certain blockages (Steel bars for instance), worse starting stats.
Possibly for races to also have unique abilities (Or attributes) attached to them (Like how classes start with an ability). An example of this could be:
Vampires capable of draining blood off of sleeping targets from behind. If the vampire drains all of the targets blood whilst they're asleep (Depends on vampire hunger amount), has possiblity to kill.
Humans being able to disguise, appearing normal for a time being whilst not doing much.
Trolls are known for their regeneration and great hunger, so perhaps the capacity to use up their food to heal faster.
Orcs having a racial rage ability, perhap stacking with the Berseker rage. Makes for a good early game, but for each class as it'd be by the race itself. Perhaps only activating upon being surrounded.
Rasimi gaining unarmed damage bonus damage, cats having claws and the like.
Dark Elves being capable of blending in with the trees, giving them a hide ability when near trees.
Races could also have certain natural defences against poison, magic damage types or physical damage.
Possible race ideas to the side, at the moment people can find that hunger/water is a tedius interruption inbetween the killfest that is Soulash. I propose that foods have some form of beneficial effect. This would make certain races (Such as a vampire) taking it as a sacrifice in a way, as they would not be able to gain the buffs from eating (Such as possible stat bonuses, or permanent stat alterations) from special meals. Be it a temporarily faster stamina regeneration, extremely minor healing, or mushrooms causing the player to have drug-like symptons.
Perhaps putting together meals (Dead wisps, dead imps, flowers, etc) made of special materials could lead to powerful effects, which is something that certain races (Vampire/Lich) would not be able to take advantage of for the trade off of how they(will) function.