For the Civlopedia:
Can there be a solid breakdown of the Game Mechanics of each leader, instead of just favorite Civ, Traits and flavor text?
I love the story, it is amazing and I still have barely broken the surface of it. However, it would be nice if it listed something about the game Mechanics: This race is Elven. This race Cannot adopt Religions. I am figuring out such things, but I fear much of it may be coming from these forums, and overall the point of the Civlopedia isn't for old-timers and veterans, it is for Newbs. If they see a new name, they should be able to find it in the Pedia, and by reading through it, understand exactly what it will cause.
Along the same lines: If a spell grants a promotion, can it link to the Promotion, or have a description of the effects from it?
And is it a 3.13 problem that you cannot click on pictures in the Tech Tree and pull up the Civlopedia, or an FfH? I swear I was able to do that in previous Civ games, but might be thinking back to Civ 3