I was thinking, since all the ebuilds have a changelog telling why the new ebuild it would be nice to make use of it. maybe a new flag for emerge that would have portage take a lok at the changelog and tell you why it wants to update the package. possibly it could look at the version you have installed and the newest version and tell you a short and dirty on why the changes. would be especially useful on those that are security upgrades.
*** This bug has been marked as a duplicate of 6124 ***