I've recently had trouble with catalyst and grp set builds where it would build a package I do not want. It would be easier to see which use flag triggered that package if catalyst could do something simliar to the output of emerge -pv <package set>. Not really concerned with how you could implement this, but something at least would be nice. It'll save time trying to tweak a grp set build.
Ignore this comment, just testing the new bugzilla server email settings
okay, this behavior is enabled now by using the --verbose flag :)