This sounds really cool. I'm excited for the elves to get in, but I suppose I'll be waiting a little while .
Are all of these different races going to be playable? And how different are they all going to be?
They are all too different and that is a problem.
To put it another way making something playable is a major commitment. The game engine guarantees that a playable civilization will be generated, which means that the moment that you make something other than vanilla dwarves playable then you run an ever increasing risk of having no dwarves in the world and hence you want those playable civilizations to be up to scratch inherantly. There are also a huge number of mechanical difficulties, these difficulties mean for instance that any giants are going to be unplayable since the game does not scale well; with giants we have giant size items and hence you will end up with several dozen bars to make one pick for instance. Not to mention how unbalancing it is to produce 1 cloth piece cloaks which are thick enough to pretty much provide a level of protection against most creatures weapons equivilant to a full suit of armour for smaller creatures. It is fortunate indeed that d&d giants are not fans of large amounts of clothing or else we would be in trouble
.
Smaller creatures are a different matter, smaller creatures are generally harder to play than larger creatures but enjoy cheaper item costs. They are however a mighty problem in adventure mode because of all those hardcoded items that cannot be scaled down by modding; you could say that large creatures are a fortress mode problem while small ones are an adventure mode problem. Assuming that they path properly in fortress mode, flying creatures are out because nothing can dig their way through walls yet, meaning that basically flying creatures are totally over-powered since they can place all their living quarters out of reach to all invaders. To recap then playability is rather determined by the following set of questions.
1. Is the creature substantially larger than human size?
2. Is the creature able to fly?
3. Can the creature have a fully developed government system without breaking with lore?
4. Does the creature rarely ever see the sunlight?
5. Does the creature have a society that can be adequately represented given the presently implemented mechanics? The last question is far more subtle than the other questions to answer. The basic problem is that everybody in DF presently lives in Communist Utopia/Communist totalitarian dystopia depending upon the player's skill and level of morals. In relationship to the vanilla creatures this is a non-problem since there is no body of lore to establish that they live in any other kind of society but for the D&D creatures it is a problem; particularly for the evil ones. The vanilla goblins can simply live in Communist totalitarian dystopia where the player deliberately plays without regard for the welfare of his goblins, but all the baddies in D&D are pretty much all either living in organised societies built on slave labour or in quasi-anarchical or anarchical bands; neither of which can be represented by present game mechanics.
That said, two kinds of gnomes the rock gnomes and lantan gnomes are set to be playable next release. The present game mechanics do gnomes very well since the latest major release is pretty much gnome heaven with all it's libraries and discoveries we now basically have everything we need to represent gnomic society in DF terms. D&D dwarves are not ever going to be a problem since
Our Dwarves are all the Same . Halflings are waiting for the arrival of proper meals and fortress mode festivals since at the moment everything is too serious for halflings. Elves I am not too sure about, playable elves should probably wait until greater options exists for automation of production since it does not befit them to simply sit around the place waiting for the elf boss to give them work. Humans are variable depending upon the nation, the centralised/collectivist nations like
Neverwinter would be playable right as things are, anarchistic nations like
Luskan will be unplayable forever probably, maritime nations like
Baldur's Gate would obviously need ships, money-worshipping crime ridden dystopias like
Amn will need Capitalism
and magical nations like
Haluua will need a fully developed system of magical research.