As Epic explained on its forums delays dotting the i's and crossing the t's held up the tools needed for modders to make their content PS3 compatible. While it usually takes a little while for the mod scene to really cranking anyway, that sparked some disappointment that PS3 gamers wouldn't be able to start adding user-created mods to their game right out of the box.
The public release of those tools remains in limbo (don't worry; it shouldn't be too long 1UP's sources say). In the meantime, Epic themselves have stepped in and using their developer version of the tool have packaged up a surprise Holiday treat for PS3 UT3 gamers. The first ever user-created, not to mention free, map for Unreal Tournament 3 on PS3 is DM-Shrine by Thomas Browett, who goes by the name Setheran on the official UT3 forums.