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I doubt either will make it to PS2. Simple fact is that they are 3rd gen games and the PS2 is a 2nd gen console.
The GC and Xbox should be able to handle both but that remains to be seen.
Get a PC and then you can play both of them.
UT2003, maybe, but the graphics will really have to be toned down to run on the console, but I still think it unlikely it will make an appearance on the console.