“CivRev was originally a 360/PS3 project and was in development for over a year before the Wii/DS platforms were added, largely because we saw the success of those platforms and a lot of people (including myself) were very excited about them," said Firaxis programmer Scott Lewis. "All of our assets were originally created with the 360/PS3 in mind. In order to bring them to the Wii, a great deal of work would have to go into making those assets look appropriate on Nintendo’s system. If we had started the project with all four platforms in mind, it is far more likely that we would not have put the Wii version of CivRev on hold."
So <a href="http://multiplayerblog.mtv.com/2008/02/04/why-2k-games-pulled-the-plug-on-the-wiis-civilization-revolution/" target="_new>now you know.