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

Calculating dependencies ... done!
Dependency resolution took 1.07 s (backtrack: 0/20).

[ebuild  N     ] dev-lang/duktape-2.7.0-r3:0/2.7.0::gentoo  1003 KiB
[ebuild  N     ] acct-group/polkitd-0-r3::gentoo  0 KiB
[ebuild  N     ] dev-libs/libgudev-238-r2::gentoo  USE="-introspection -test" 30 KiB
[ebuild  N     ] acct-user/polkitd-0-r3::gentoo  0 KiB
[ebuild  N     ] sys-auth/polkit-126-r3::gentoo  USE="nls pam -elogind -examples -gtk -introspection -kde (-selinux) (-systemd) -test" 446 KiB
[ebuild  N     ] sys-power/upower-1.91.3:0/3::gentoo  USE="policykit -doc -introspection -ios (-selinux) -test" 167 KiB
[ebuild  N     ] x11-plugins/wmbattery-2.56::gentoo  USE="upower -apm" 118 KiB

Total: 7 packages (7 new), Size of downloads: 1762 KiB