This will be very interesting to watch. Last time they had an amnesty rule, there weren't too many useful players cut loose. However, that rule was somewhat weak, since it did not help the cap, just the luxury tax. If this rule is part of the CBA, and allows them to completely get guys off the cap, I think it will definitely put some interesting names out there.
Although if they roll back salaries, that also might make more of these guys contracts more palatable.
I think the guys you will definitely see cut would be Baron Davis, Arenas, Posey (because they will have more cap space), maybe Artest, and maybe Rip Hamilton. Beyond that, I am not sure how much it will be used.