Looks like we've got Matt Holliday, Prince Fielder, Ryan Howard, and Albert Pujols for the National League and Justin Morneau, Alex Rios, Vladimir Guerrero, and Magglio Ordonez.
Pretty much impossible to predict these things, but one would have to think that Prince Fielder could do pretty well with something like this.
I hate to say it, but baseball needs to figure out a way to make guys participate in these things if they're physically able. There's really no reason not to have Griffey and Bonds out there tonight since this is essentially glorified batting practice.