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

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] x11-themes/hicolor-icon-theme-0.17::gentoo  52 KiB
[ebuild  N     ] x11-themes/vertex-icon-theme-20150506-r1::gentoo  5448 KiB

Total: 2 packages (2 new), Size of downloads: 5500 KiB