i remember a interview with one of the developers where he said he hopes it will sell 2,5 Millions, because then they would make another sequel for sure.
Edit: i found the thread and some pretty funny predictions to go with it
http://www.vgchartz.com/forum/thread.php?id=88589&page=1
“It appeared that there had even been demonstrations to thank Big Brother for raising the chocolate ration to twenty grams a week. And only yesterday, he reflected, it had been announced that the ration was to be reduced to twenty grams a week. Was it possible that they could swallow that, after only twenty-four hours? Yes, they swallowed it.”
- George Orwell, ‘1984’