Release
From PSU Cyril Wiki
Currently, the official release dates given by Sega are:
Japan - 2006
North America - Fall 2006
Europe - Summer 2006
These dates apply only to the PC (Windows) and PS2 versions of the game. Xbox360 release dates have not been announced.
It should also be noted that these dates are subject to (and are likely to) change, as the Japanese version has been delayed numerous times. It remains possible that PSU will see a Fall release in North America, however the Summer 2006 date given for Europe is almost certainly outdated and/or erroneous.