Modders can discuss what they may do with their existing mods ... I for one will be looking at adapting my mod under development to the new Civ 5.
We're already discussing partially in Civ4 C&C, and why can't we discuss here?
I don't mean the same version of the Gamebryo used in Civ 4, but the most recent revision. Gamebryo was used for Fallout 3 and the forthcoming Fallout: New Vegas. The latest version of Gamebryo supports DirectX 11 so it is still a good possibility I would think. Firaxis have in-house knowledge and experience of that engine.
Well, good point.
But for me the screenshots don't look in that way. If they used the same engine like Fallout 3, then i would expect graphically "better" screenies.
Edit: If they don't then NifSkope will be of no use and we might need new importers and exporters for Blender.
I guess, they use something which Blender already can handle.