I would like to see yum display the per-repo mirror hostname it is using to download content. And if for some reason, yum falls back from one mirror to another for that repo, to display the new mirror's hostname.
This would aid users and mirror admins alike to determine which mirror is in active use at any given time, so that if a problem does occur, that information can be included in the problem report. For myself, I run a 'netstat | grep EST' in another window to see which mirror is in use, but I don't think that's ideal.