UT2007 is not a launch title
Therfore my source has to be wrong on the date. BUT... BBC has a article about the next generation of gaming where Ubisoft head Yves Guillemot makes some educated guesses in the release of the PS3. We think September could be the right time for Sony in the US and November in Europe," said Ubisoft's Mr Guillemot, "Japan a bit earlier, say June or July." he said.
**UPDATE**
As of this morning, January 3rd, 2006, Sony again informed GameSHOUT that the Sony PS3 will be released in May 2006, and that the recent reports of a delay are pure "myths".
http://www.gameshout.com/news/012006/article2274.htm