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

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] x11-libs/xcb-util-0.4.1::gentoo  262 KiB
[ebuild  N     ] x11-misc/xss-lock-0.3.0_p20140302-r2::gentoo  USE="man" 12 KiB

Total: 2 packages (2 new), Size of downloads: 273 KiB