A recent article by Soren Johnson states:
However, a more important (and actually true) first is less often mentioned – CivRev is the first Civ since the original to be designed and programmed directly by Sid. Every line of game and AI code (and probably quite a bit more) inside the game was written by Sid himself, for all three versions: 360, PS3, and DS.
I believe it’s great that just one man (even if it’s “just” Sid Meier) is able to program the game for three platforms at once. It is almost as if he acted like a modder of his own game.
Also, if you take in consideration the date CivRev was announced, now that we know only one person programmed the gameplay for two radically different platforms (more like two actually, seeing how the PS3 and Xbox are pretty much oversized computers), man, was that fast development or what!
Really, I would love seeing more of this: spend less time creating assets and more time creating gameplay! Please?