Kate Mcphee has supposedly chosen THE WAY YOU LOOK TONIGHT ( already performed by David Radford ). Jasmine Trias did a good version of this in big band night in Season 3.
Paris Bennett apparently will sing "These Foolish Things" - Also according to the same Fox news station in Fort Lauderdale.
Ace Young chooses "That's All" - The only source for this is the official idol forums...
NOT SURE.