The Deus Ex: Invisible War demo was supposed to be out today. Obviously, it is not. Computer and Videogames is reporting that it has been delayed due to a "problem" with the demo.
Worst-case scenario, according to Eidos, is that we'll now see the Deus Ex: Invisible War demo made available on Monday or Tuesday of next week, but remaining positive in the face of this small disaster the publisher also commented that it's entirely possible that the problem will be rectified quickly allowing a release tomorrow.