A few low-key Japanese developement projects will be exclusive to PS3, which will eventually come to the USA. Stuff like Blazblue, Cross Edge, Disgaea 3 etc. We'll see a few of these every year but er, that's gonna be it for non-Sony influenced exclusives.
Other then that, everything is going to be PS360, no ones going to support either platform exclusively without Microsoft or Sony giving them a reason to.
The major publishers seem happy at the moment to keep their higher tier teams on PS360 developement and their more inexperienced teams on the Wii. I honstly don't see that changing in the west, not so sure about Japan though.