On the official ut forum mark rein answers to the newest rumours.
mark rein: "As a public company, Midway felt an obligation to its shareholders to let them know about the possibility of a delay. But our goal is still to get the PS3 version of UT3 in stores before the end of 2007. However, we will only ship it once it's ready and is the best game we can deliver. The PC version is still on track for a November release."
mark rein said further:
"Yes, there is a chance it will come out in December.
In addition there is some good news as well. A little extra time in development means that now the PS3 version will have all of the same maps as the PC version which wasn’t previously expected to be the case."