I just hope it's simpler to mod like Civ 3 and not like civ 4. Civ 4 modding was difficult for me to figure out, and we already got alot of tools, so maybe they are talking about actual editors with the game or something.
While having editors makes it more easy to mod, there is a great risk in limiting it too much. Civ3 was a serious step backwards from the modability of Civ2. Many of the popular mods, Fall from heaven, Rise of Man, Rhys and Fall, would be impossible to do in Civ3.