The other taboo question...
I've been doing a lot of fiddling about and some play-testing. I think that the West African civs and Kanem-Bornu are more or less done and balanced. The West African game revolves around finding and claiming resources, before building the improvements that require them, which create treasure units, which are then loaded onto camels and taken to Morocco, Tunisia or Egypt... The main problem with this is that the AI don't take their treasure there, as a rule. So I think that this part of the game will be most fun as a MP game... I'm planning the MP element of the game as I go along rather than making it an add-on. I'm thinking of releasing several MP versions - one on a smaller map with fewer civs, and then a couple more which are full-size and with all the civs, but only half the map (because you can have only eight civs total on a MP map). So if you want to play the trading race MP, you can do it on one map; if you want to fight the Abyssinian wars, you can do that on another.
Kanem-Bornu turns out to be immense fun to play. I'm very pleased with that part. The game here consists of expanding as fast as you can and then splatting the other civs you meet. I think we can all see the appeal of that.
So I need to test the Nubians, Ethiopians and Falasha. At the moment, the AI is not very good at any of these civs, so a lot of the fiddling will concern trying to get the AI to behave appropriately. In particular, it shows no inclination to fight naval wars in the Red Sea. I think I need to alter the map in this region to provide a bit more space for everyone: there's not much potential for Makuria, in particular, being stuck with nothing but desert and flood plains.
One minor problem in all this is that I've just discovered I'm going to be leaving the country in three months to do a degree overseas, which means I have a lot of other stuff to wind up first... so the pace of development may slow slightly! Fortunately it's mostly fiddling about, so this can be done at the same time as more important things... at least in theory...