Unreal Tournament 3 are out of luck -- Epic vice president Mark Rein has confirmed on the developer's forums that the first-person shooter will not use Games For Windows Live and will therefore not feature cross-platform play between Microsoft's console and the PC.
Rein said that they have not decided about cross-platform play between PC and the PlayStation 3. "We're not 100% sure that users want that feature but if we get time we'll play around with it and see how it works," he said. Sony's console will have the ability to share PC mods, so the the logistics of PC vs. PS3 play shouldn't be too hard.
No release date has been given but Unreal Tournament 3 has been confirmed as a timed exclusive for the PS3.