Will there be options for combat, such as different types of melee weapons, ranged weapons, or possibly even dwarven mages?
If magic exists it would be interesting if there were options for lobbing fireballs at things, or having other dwarves specialize at healers. I'm not saying that magic would be needed in game at all, but I have no idea what kind of game this is gonna be. DF is a very low magic game, with really the only magic existing in game involving undead and other horrible creatures that exist to menace your dorfs, yet DF is still an awesome grimdark game without magic. (Though having Urist McPyro training up to become a legendary fire mage in a fireproof magic target range would be all kinds of !!fun!!...
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Will A Game of Dwarves be high fantasy or low fantasy?
I enjoyed mix of different classes in Majesty 2 where each different class brought different abilities to the table, but greatly disliked how the game difficulty ramped up over time, such that it turned into a RUSHZOMG sort of game.
Military minions in Evil Genius did more or less the same thing, just did different amounts of damage. Some variety in dwarves would be fun, and likewise there would need to be some way to be able to keep dwarves on duty to guard the fortress against invasion, rather than hope a soldier wanders by randomly before too many peasants are murdered. Guard posts, barracks rooms where military dwarves hang out, or something like that would be useful.