Has anyone seen any information on CPU, graphics card and memory requirements? Probably a premature question, but who knows.
Nothing definitive but you can infer some information here
Q: What are the requirements to run Galactic Civilizations III?
A:It will require a 64-bit version of Windows 7 or 8 along with a DirectX 10 or 11 compatible video card. There will be no 32-bit version. Most PC gamers in 2013 have this kind of hardware, and it allows us to create the best game possible for the majority of our customers.
So you're looking at Vista or above (to meet the DX10/11 requirements) and a 64 bit OS, since there will be no 32-bit version.
That's all the official information that is available right now.
Everything below is pure conjecture. Take it all with a metric ton of salt. I'm more or less "making stuff up" now so take it for what that is.
In terms of 'broad' inference:
1) MORE MEMORY is better since we're talking about 64 bit
2) Faster CPU and MORE cores is better. We can assume that given this 'high' requirement that the game will assume you have a multi-core system and act accordingly. More cores means more AI churning power.
3) Graphics wise, not much. Other than DX10/11 requirement. But you can probably assume that it's going to be something like Civ5 in terms of graphical requirments