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

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] x11-libs/xcb-util-0.4.1::gentoo  262 KiB
[ebuild  N     ] x11-libs/xcb-util-wm-0.4.2::gentoo  279 KiB
[ebuild  N     ] x11-misc/sxhkd-0.6.3::gentoo  36 KiB
[ebuild  N     ] x11-wm/bspwm-0.9.12::gentoo  116 KiB

Total: 4 packages (4 new), Size of downloads: 691 KiB