These are the packages that would be merged, in order:

Calculating world dependencies  .  ... done!
[ebuild     U ] app-portage/portage-utils-0.1.29 [0.1.28] 0 kB
[ebuild     U ] sys-apps/shadow-4.0.18.2 [4.0.18.1-r1] USE="cracklib nls pam -nousuid (-selinux) -skey" 0 kB
[ebuild     U ] sys-boot/grub-0.97-r4 [0.97-r3] USE="-custom-cflags -netboot -static" 0 kB

Total: 3 packages (3 upgrades), Size of downloads: 0 kB