2011-10-07: About dungeons and other things
@Pazyryk: If you say so, I'll give it a try

I don't want it to be the same as in FFH, I prefer the dungeons to be always guarded by monsters, so if a unit enters an adjacent tile, monsters will appear (I think it can be done by making 2 versions of the dungeon improvement - guarded and unguarded; it will become unguarded after spawning the monsters). The rewards for exploring them can include gold, items (in form of promotions like in FFH, I hope I won't hit the promotion limit), a unit joining you, and probably some other things as well - resources, culture, population etc. The problem is getting the AI to use them properly, I guess I'll make the monsters they release unable to move (until a human player's unit moves next to them and they aren't on an AI's territory). I remember in FFH a monster released from a dungeon by the AI can destroy an entire civilization, and I don't want such things to happen in my mod. Btw is it possible to use custom LUA functions when exploring a goody hut? Then I'll just use the goody hut mechanics for most rewards, and custom functions for things like items and new resources appearing, also making them goody huts will make the AI want to explore them.
Generally explorable dungeons are a complicated matter, so they probably won't be included in the first version. But it's a good thing to have in a fantasy mod, so I'll work on them later (or copy some solutions from your mod when it's released and modify them, if you allow me

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@Ahriman: Thanks, for now I'm going to use the El Dorado graphics as Ancient Pyramid that gives things like science and culture (it won't be unique, you'll be able to find several of them on a single map, they will be something like a better version of Ancient Ruins). There definitely will be bonuses from Ancient Ruins, Ancient Pyramids and nodes for certain races. Magical races will get more mana from nodes (Essentes will get x1.5 mana from all node types, some other races x2 from a specific type). Better yields from nodes are possible too (there will be a race that doesn't use magic, so they will get no mana from nodes at all [if it's possible to use negative modifiers], but lots of science instead).
I'm afraid you'll have to wait several months for a playable version. Design suggestions are always welcome, but there aren't any specific areas where I particularly need them.
@texdionis: I like the name Lemuria for the Jungle Tribes, so I think I'll use it, thanks for the idea

But I don't know much about the Lemurian legends, so I don't think I can add anything in terms of flavor. Atlantis can be used instead of the Dreamers, but I think it's used too much in popular culture, and I like the current name.