It'll probably be well-made since almost all Firaxis games are. The question is if the changes they make it will make the game better than Civ4. They are removing many cool things, so I hope they've replaced them with equally cool things. Better diplomacy would be a great one for me. Generally, they've been pretty good at simplifying or removing a feature in order to add other cool features. I'm hoping that's the case with religion because it was a very welcome addition (one I was actually initially skeptical of, but they pulled off so very well).