This was taken from Neogaf. The answer comes from a someone on the dev team of Civilization Revolution

(In regards to online for Wii and DS) We have the DS running, still working on the Wii. I’m not the multiplayer programmer, but I assume that the GameSpy API is similar between the DS and the Wii, so it shouldn’t be any trouble at all.

This is great news to me!!! I love Civilization, and I have always wanted to test my wits against other Rulers.