I didn't realize it was only 30fps on PS3, they'd better fix that on 360.
It'll be 30fps on 360 as well.

budget console hardware

On a related note, it's interesting that the PS3 version only ran at 30fps because UT3 is one of the few games that is more CPU limited than GPU limited.
At low resolutions, such as 720p, frameate in UT3 is more often constrained by CPU power. It's interesting that even with Cell's supposed power, UT3 still runs at only 30fps.
Guess the Cell isn't more powerful than a high end Quad-core Intel processor like some people think.