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-misc/dmenu-5.4::gentoo  USE="-savedconfig -xinerama" 17 KiB
[ebuild  N     ] x11-wm/musca-0.9.24_p20100226-r4::gentoo  USE="-apis -savedconfig -xlisten" 80 KiB

Total: 2 packages (2 new), Size of downloads: 97 KiB